Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · December 1, 2025
The heavy charm and bottom quarks are unique probes of the transport properties of the quark-gluon plasma (QGP) and its hadronization in high-energy nuclear collisions. A key challenge in this context is to embed the interactions of the heavy quarks in the ...
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Journal ArticlePhysical Review C · July 17, 2025
A new framework, called X-SCAPE, for the combined study of both hard and soft transverse momentum sectors in high-energy proton-proton (p-p) and proton-nucleus (p-A) collisions is set up. A dynamical initial state is set up using the 3D-GLAUBER model with ...
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Journal ArticlePhysical Review C · June 17, 2025
An investigation of high-transverse-momentum (high-pT) photon-triggered jets in proton-proton (
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Journal ArticlePhysical Review C · May 1, 2025
The JETSCAPE Collaboration reports a new determination of the jet transport parameter q in the quark-gluon plasma (QGP) using Bayesian inference, incorporating all available inclusive hadron and jet yield suppression data measured in heavy-ion collisions a ...
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Journal ArticleNuovo Cimento Della Societa Italiana Di Fisica C · January 1, 2025
We examine nonequilibrium dynamics in proton-nucleus collisions at LHC energy by comparing the Parton-Hadron-String-Dynamics (PHSD) transport approach with the (2+1)dimensional viscous hydrodynamic model VISHNew. The latter is initialized with initial cond ...
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Journal ArticleJournal of the American Statistical Association · January 1, 2025
The Quark-Gluon Plasma (QGP) is a unique phase of nuclear matter, theorized to have filled the Universe shortly after the Big Bang. A critical challenge in studying the QGP is that, to reconcile experimental observables with theoretical parameters, one req ...
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Journal ArticleEuropean Physical Journal Special Topics · January 1, 2025
Volume 3 of the FCC Feasibility Report presents studies related to civil engineering, the development of a project implementation scenario, and environmental and sustainability aspects. The report details the iterative improvements made to the civil engine ...
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Journal ArticleEPJ Web of Conferences · 2025
Prompt photons are important yet challenging to observe in relativistic heavy-ion collisions, as they are produced in the early stages and traverse almost the entire QGP medium without interaction. Experimental analyses typical ...
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Journal ArticleEPJ Web of Conferences · 2025
We investigate the impact of the hadronic phase on jet quenching in nuclear collider experiments, an open question in heavy-ion physics. Previous studies in a simplified setup suggest that hadronic interactions could have signi ...
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Journal ArticlePhysical Review C · October 1, 2024
We present predictions and postdictions for a wide variety of hard jet-substructure observables using a multistage model within the jetscape framework. The details of the multistage model and the various parameter choices are described in [Phys. Rev. C 107 ...
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ConferenceEPJ Web of Conferences · June 26, 2024
The BEST Collaboration equation of state combining lattice data with the 3D Ising critical point encounters limitations due to the truncated Taylor expansion up to µB/T ∼ 2.5. This truncation consequently restricts its applicability at high dens ...
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Journal ArticlePhysical Review C · June 1, 2024
We study parton energy-momentum exchange with the quark gluon plasma (QGP) within a multistage approach composed of in-medium Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution at high virtuality, and (linearized) Boltzmann transport formalism at lower v ...
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Journal ArticlePhysical Review D · May 1, 2024
We present a novel construction of the QCD equation of state (EoS) at finite baryon density. Our work combines a recently proposed resummation scheme for lattice QCD results with the universal critical behavior at the QCD critical point. This allows us to ...
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Journal ArticlePhysical Review C · May 1, 2024
Heavy-flavor hadrons produced in ultrarelativistic heavy-ion collisions are a sensitive probe for studying hadronization mechanisms of the quark-gluon-plasma. In this paper, we survey how different transport models for the simulation of heavy-quark diffusi ...
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Journal ArticleProgress in Particle and Nuclear Physics · January 1, 2024
The nuclear equation of state (EOS) is at the center of numerous theoretical and experimental efforts in nuclear physics. With advances in microscopic theories for nuclear interactions, the availability of experiments probing nuclear matter under condition ...
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Journal ArticleTechnometrics · January 1, 2024
With advances in scientific computing and mathematical modeling, complex scientific phenomena such as galaxy formations and rocket propulsion can now be reliably simulated. Such simulations can however be very time-intensive, requiring millions of CPU hour ...
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Journal ArticleSIAM Asa Journal on Uncertainty Quantification · January 1, 2024
In an era where scientific experimentation is often costly, multi-fidelity emulation provides a powerful tool for predictive scientific computing. While there has been notable work on multi-fidelity modeling, existing models do not incorporate an important ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · June 1, 2023
Bayesian parameter estimation provides a systematic approach to compare heavy-ion collision models with measurements, leading to constraints on the properties of nuclear matter with proper accounting of experimental and theoretical uncertainties. Aside fro ...
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Journal ArticlePhysical Review C · May 1, 2023
Parton energy-momentum exchange with the quark gluon plasma (QGP) is a multiscale problem. In this work, we calculate the interaction of charm quarks with the QGP within the higher twist formalism at high virtuality and high energy using the Modular All Tw ...
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Journal ArticlePhysical Review C · March 1, 2023
We present a new study of jet interactions in the quark-gluon plasma created in high-energy heavy-ion collisions, using a multistage event generator within the jetscape framework. We focus on medium-induced modifications in the rate of inclusive jets and h ...
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Journal ArticlePhysical Review C · December 1, 2022
We use a Bayesian-calibrated multistage viscous hydrodynamic model to explore deuteron yield, mean transverse momentum and flow observables in Pb-Pb collisions at the Large Hadron Collider. We explore theoretical uncertainty in the production of deuterons, ...
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Journal ArticlePhysical Review C · October 1, 2022
We investigate the effects of nonequilibrium dynamics in small colliding systems by comparing a nonequilibrium transport approach, Parton-Hadron-String Dynamics (PHSD), with a (2+1)-dimensional viscous hydrodynamic model, VISHNew. Focusing on p+Pb collisio ...
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Journal ArticlePhysical Review C · March 1, 2022
An energetic parton traveling through a quark-gluon plasma loses energy via occasional hard scatterings and frequent softer interactions. Whether or not these interactions admit a perturbative description, the effect of the soft interactions can be factori ...
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ConferenceProceedings of Science · September 1, 2021
Interactions between hard partons and the quark-gluon plasma range from frequent soft interactions to rare hard interactions. While it is reasonable that hard interactions can be described perturbatively, soft interactions likely have significant non-pertu ...
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Journal ArticlePhysical Review C · August 1, 2021
We report a new determination of q, the jet transport coefficient of the quark-gluon plasma. We use the JETSCAPE framework, which incorporates a novel multistage theoretical approach to in-medium jet evolution and Bayesian inference for parameter extractio ...
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Journal ArticleNuclear Physics A · January 1, 2021
The heavy-flavor transport coefficients contain important information on the strong interaction at finite temperatures. The extraction of these numbers from experimental data requires dynamical modeling of heavy-flavor transport that is coupled to realisti ...
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Journal Article · December 7, 2020
An energetic parton travelling through a quark-gluon plasma loses energy via
occasional hard scatterings and frequent softer interactions. Whether or not
these interactions admit a perturbative description, the effect of the soft
interactions can be factor ...
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Journal ArticlePhysical Review C · November 10, 2020
The JETSCAPE framework is a modular and versatile Monte Carlo software package for the simulation of high energy nuclear collisions. In this work we present a new tune of JETSCAPE, called PP19, and validate it by comparison to jet-based measurements in p+p ...
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Journal Article · November 6, 2020
We study the properties of the strongly-coupled quark-gluon plasma with a
multistage model of heavy ion collisions that combines the T$_\mathrm{R}$ENTo
initial condition ansatz, free-streaming, viscous relativistic hydrodynamics,
and a relativistic hadroni ...
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Journal Article · October 8, 2020
Using combined data from the Relativistic Heavy Ion and Large Hadron
Colliders, we constrain the shear and bulk viscosities of quark-gluon plasma
(QGP) at temperatures of ${\sim\,}150{-}350$ MeV. We use Bayesian inference to
translate experimental and theo ...
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Journal Article · September 11, 2020
Motivated by recent applications of the open quantum system formalism to
understand quarkonium transport in the quark-gluon plasma, we develop a set of
coupled Boltzmann equations for open heavy quark-antiquark pairs and quarkonia.
Our approach keeps track ...
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Journal Article · September 4, 2020
We present a multi-stage model for jet evolution through a quark-gluon plasma
within the JETSCAPE framework. The multi-stage approach in JETSCAPE provides a
unified description of distinct phases in jet shower contingent on the
virtuality. We demonstrate a ...
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Journal Article · August 17, 2020
Measurements at the RHIC and the LHC have observed flavor dependence of
single-hadron suppression, which reveal the role played by quark masses in the
parton interactions with the quark-gluon plasma (QGP) medium. In this study, we
explore the manifestation ...
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Journal ArticlePhysical Review C · July 1, 2020
Background: The near-equilibrium properties of a QCD plasma can be encoded into transport coefficients such as bulk and shear viscosity. In QCD, the ratio of these transport coefficients to entropy density, ζ/s and η/s, depends nontrivially on the plasma's ...
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Journal Article · April 14, 2020
We develop a framework of coupled transport equations for open heavy flavor
and quarkonium states, in order to describe their transport inside the
quark-gluon plasma. Our framework is capable of studying simultaneously both
open and hidden heavy flavor obs ...
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Journal ArticlePhysical Review C · April 1, 2020
Heavy quarks produced in relativistic heavy-ion collisions are known to be sensitive probes of the hot and dense QCD matter they traverse. In this paper we study how their dynamics is affected by the nature of the bulk evolution of the QCD matter, the init ...
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Journal Article · February 27, 2020
We study the medium response to jet evolution in the quark-gluon plasma
within the JETSCAPE framework. Recoil partons' medium response in the weakly
coupled description is implemented in the multi-stage jet energy-loss model in
the framework. As a further ...
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Journal Article · February 17, 2020
We present a jet quenching model within a unified multi-stage framework and
demonstrate for the first time a simultaneous description of leading hadrons,
inclusive jets, and elliptic flow observables which spans multiple centralities
and collision energies ...
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Journal Article · February 16, 2020
The interaction of heavy flavor with the quark-gluon plasma (QGP) in
relativistic heavy-ion collisions is studied using JETSCAPE, a publicly
available software package containing a framework for Monte Carlo event
generators. Multi-stage (and multi-model) e ...
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Journal Article · February 13, 2020
Multistage models based on relativistic viscous hydrodynamics have proven
successful in describing hadron measurements from relativistic nuclear
collisions. These measurements are sensitive to the shear and the bulk
viscosities of QCD and provide a unique ...
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Journal Article · February 10, 2020
Using the open quantum system formalism and effective field theory of QCD, we
derive the Boltzmann transport equation of quarkonium inside the quark-gluon
plasma. Our derivation illuminates that the success of transport equations in
quarkonium phenomenolog ...
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Journal ArticlePhysical Review C · February 1, 2020
We posit a unified hydrodynamic and microscopic description of the quark-gluon plasma (QGP) produced in ultrarelativistic p-Pb and Pb-Pb collisions at sNN=5.02TeV and evaluate our assertion using Bayesian inference. Specifically, we model the dynamics of b ...
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Journal ArticlePhysical Review C · December 23, 2019
Hard probes produced in perturbative processes are excellent probes for the study of the hot and dense QCD matter created in relativistic heavy-ion collisions. Transport theory, allowing for coupling to an evolving medium with fluctuating initial condition ...
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Journal ArticleNature Physics · November 1, 2019
Ultrarelativistic collisions of heavy atomic nuclei produce an extremely hot and dense phase of matter, known as quark–gluon plasma (QGP), which behaves like a near-perfect fluid with the smallest specific shear viscosity—the ratio of the shear viscosity t ...
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Journal ArticleEuropean Physical Journal Special Topics · July 1, 2019
In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered an energy-frontier hadron collider ...
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Journal ArticleEuropean Physical Journal Special Topics · July 1, 2019
In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered an energy-frontier hadron collider ...
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Journal ArticlePhysical Review D · June 20, 2019
A quantitatively reliable theoretical description of the dynamics of fluctuations in nonequilibrium is indispensable in the experimental search for the QCD critical point by means of ultrarelativistic heavy-ion collisions. In this paper we consider the flu ...
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Journal ArticleEuropean Physical Journal C · June 1, 2019
We review the physics opportunities of the Future Circular Collider, covering its e+e-, pp, ep and heavy ion programmes. We describe the measurement capabilities of each FCC component, addressing the study of electroweak, Higgs and st ...
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Journal ArticleEuropean Physical Journal Special Topics · June 1, 2019
In response to the 2013 Update of the European Strategy for Particle Physics, the Future Circular Collider (FCC) study was launched, as an international collaboration hosted by CERN. This study covers a highest-luminosity high-energy lepton collider (FCC-e ...
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Journal ArticlePhysical Review C · May 28, 2019
Several transport models have been employed in recent years to analyze heavy-flavor meson spectra in high-energy heavy-ion collisions. Heavy-quark transport coefficients extracted from these models with their default parameters vary, however, by up to a fa ...
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Journal Article · March 18, 2019
The JETSCAPE simulation framework is an overarching computational envelope
for developing complete event generators for heavy-ion collisions. It allows
for modular incorporation of a wide variety of existing and future software
that simulates different asp ...
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Journal Article · February 15, 2019
The JETSCAPE Collaboration has recently announced the first release of the
JETSCAPE package that provides a modular, flexible, and extensible Monte Carlo
event generator. This innovative framework makes it possible to perform a
comprehensive study of multi ...
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Journal ArticleNuclear Physics A · February 1, 2019
We develop a set of coupled Boltzmann equations to describe the dynamical evolution of heavy quarks and quarkonia inside the quark-gluon plasma. The quarkonium dissociation and recombination terms are calculated from pNRQCD. Their interplay drives the syst ...
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Journal ArticleNuclear Physics A · February 1, 2019
We apply a well tested hybrid transport model, which couples viscous hydrodynamics to a hadronic afterburner, to describe bulk observables in proton-lead and lead-lead collisions at sNN=5.02TeV. The quark-gluon plasma (QGP) initial conditions ar ...
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Journal ArticlePhysical Review C · January 10, 2019
Heavy flavor observables provide valuable information on the properties of the hot and dense quark-gluon plasma (QGP) created in ultrarelativistic nucleus-nucleus collisions. Various microscopic models have successfully described many of the observables as ...
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ConferenceProceedings of Science · January 1, 2019
Hard partons lose energy when propagating through the quark-gluon plasma by interacting with plasma particles. These parton-plasma interactions consist of frequent soft interactions and occasional hard scatterings. A reformulated parton energy loss model b ...
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ConferenceProceedings of Science · January 1, 2019
Heavy quarks with large transverse momenta lose energy mainly through radiative processes. However, a Monte-Carlo implementation of gluon emission in an event-by-event fluctuating medium background is a non-trivial task. This is because the Landau-Pomeranc ...
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ConferenceProceedings of Science · January 1, 2019
JETSCAPE is a modular, flexible, and extensible Monte Carlo event generator for simulating Heacy Ion collisions under various collision systems and collision energy. In this work, we continue the benchmark of such a framework in p+p collisions under the he ...
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Journal Article · December 15, 2018
The modification of jet substructure in relativistic heavy-ion collisions is
studied using JETSCAPE, a publicly available software package containing a
framework for Monte Carlo event generators. Multi-stage jet evolution in
JETSCAPE provides an integrated ...
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Journal ArticlePhysical Review C · December 5, 2018
In relativistic heavy-ion collisions, the production of heavy quarks at large transverse momenta is strongly suppressed compared to proton-proton collisions. In addition, an unexpectedly large azimuthal anisotropy was observed for the emission of charmed h ...
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Journal ArticlePhysical Review C · November 28, 2018
We study the impact of the Landau-Pomeranchuk-Midgal (LPM) effect on the dynamics of parton interactions in proton-proton collisions at energies available at the CERN Large Hadron Collider. For our investigation we utilize a microscopic kinetic theory base ...
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Journal ArticlePhysical Review C · June 14, 2018
We investigate the transport dynamics of partons in proton-proton collisions at the CERN Large Hadron Collider using a Boltzmann transport approach, the Parton Cascade Model (PCM). The calculations include semihard perturbative quantum chromodynamics inter ...
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Journal ArticlePhysical Review C · April 13, 2018
We determine the probability distributions of the shear viscosity over the entropy density ratio η/s in the quark-gluon plasma formed in Au + Au collisions at sNN=19.6,39, and 62.4GeV, using Bayesian inference and Gaussian process emulators for a model-to- ...
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ConferenceEPJ Web of Conferences · February 2, 2018
In an era of high-precision determinations of QGP properties a full incorporation of fluid dynamical fluctuations into our models has become crucial, in particular, when describing the dynamics of small systems or near the conjectured QCD critical point. I ...
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ConferenceEPJ Web of Conferences · February 2, 2018
We apply a Bayesian model-to-data analysis on an improved Langevin framework to estimate the temperature and momentum dependence of the heavy quark diffusion coefficient in the quark-gluon plasma (QGP). The spatial diffusion coefficient is found to have a ...
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Journal ArticlePhysical Review C · January 24, 2018
By applying a Bayesian model-to-data analysis, we estimate the temperature and momentum dependence of the heavy quark diffusion coefficient in an improved Langevin framework. The posterior range of the diffusion coefficient is obtained by performing a Mark ...
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Journal ArticleProceedings of Science · January 1, 2018
By coupling the Boltzmann transport equations of both quarkonium and open heavy quarks, we investigate their dynamical evolution inside the quark-gluon plasma and study quarkonium production in heavy ion collisions. The Boltzmann transport equation of quar ...
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ConferenceProceedings of Science · January 1, 2018
Interactions between hard partons and the quark-gluon plasma range from frequent soft interactions to rare hard scatterings. The larger number of soft interactions makes possible an effective stochastic description of parton-plasma interactions in terms of ...
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ConferenceProceedings of Science · January 1, 2018
Recent progress in open-heavy-flavor measurements and future experimental upgrades are bringing heavy-flavor physics into the precision era, allowing for strong quantitative constraints on the transport properties of heavy quarks in the quark-gluon plasma. ...
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Journal ArticlePhysical Review C · December 27, 2017
We study the production and dynamics of heavy quarks in the parton cascade model for relativistic heavy ion collisions. The model is motivated by the QCD parton picture and describes the dynamics of an ultrarelativistic heavy ion collision in terms of casc ...
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Journal ArticleNuclear Physics A · November 1, 2017
We study the effects of nucleon substructure on bulk observables in proton-lead collisions at the LHC using Bayesian methodology. Substructure is added to the TRENTo parametric initial condition model using Gaussian nucleons with a variable number of Gauss ...
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Journal ArticleNuclear Physics A · November 1, 2017
We perform a global Bayesian analysis of a modern event-by-event heavy-ion collision model and LHC data at s=2.76 and 5.02 TeV. After calibration, the model simultaneously describes multiplicity, transverse momentum, and flow data at both beam energies. We ...
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Journal ArticleNuclear Physics A · November 1, 2017
The quality of data taken at RHIC and LHC as well as the success and sophistication of computational models for the description of ultra-relativistic heavy-ion collisions have advanced to a level that allows for the quantitative extraction of the transport ...
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Journal ArticleNuclear Physics A · November 1, 2017
We investigate the collision energy dependence of η/s in a transport + viscous hydrodynamics hybrid model. A Bayesian analysis is performed on RHIC beam energy scan data for Au + Au collisions at sNN=19.6, 39, and 62.4 GeV. The resulting posteri ...
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Journal ArticleNuclear Physics A · November 1, 2017
The description of dynamical fluctuations near the QCD critical point in heavy-ion collisions is crucial for understanding the existing and upcoming experimental data from the beam energy scan programs. In this talk we discuss the evolution of fluctuations ...
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Journal ArticleNuclear Physics A · November 1, 2017
Using a Bayesian model-to-data analysis, we estimate the temperature dependence of the heavy quark diffusion coefficients by calibrating to the experimental data of D-meson RAA and v2 in AuAu collisions (sNN=200 GeV) and Pb ...
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Journal ArticlePhysical Review C · October 25, 2017
We study the initial three-dimensional spatial configuration of the quark-gluon plasma (QGP) produced in relativistic heavy-ion collisions using centrality and pseudorapidity-dependent measurements of the medium's charged particle density and two-particle ...
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Journal ArticlePhysical Review C · August 22, 2017
The modification of hard jets in an extended static medium held at a fixed temperature is studied using three different Monte Carlo event generators: linear Boltzmann transport (LBT), modular all twist transverse-scattering elastic-drag and radiation (MATT ...
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Journal ArticlePhysical Review C · August 8, 2017
The impact of nonequilibrium effects on the dynamics of heavy-ion collisions is investigated by comparing a nonequilibrium transport approach, the Parton-Hadron-String-Dynamics (PHSD), to a 2D+1 viscous hydrodynamical model, which is based on the assumptio ...
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ConferenceNuclear and Particle Physics Proceedings · August 1, 2017
By applying a Bayesian model-to-data comparison, our improved Langevin transport model simultaneously describes the D-meson nuclear modification factor RAA and elliptic flow v2 in heavy-ion collisions at both RHIC and LHC energies on ...
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ConferenceNuclear and Particle Physics Proceedings · August 1, 2017
The initial three-dimensional entropy distribution of the quark-gluon plasma produced in relativistic heavy-ion collision is systematically studied using parametric initial conditions. We apply a cumulant generating function approach to parametrize the rap ...
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Journal ArticleEuropean Physical Journal A · May 1, 2017
Open and hidden heavy-flavor physics in high-energy nuclear collisions are entering a new and exciting stage towards reaching a clearer understanding of the new experimental results with the possibility to link them directly to the advancement in lattice Q ...
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Journal ArticleEuropean Physical Journal C · April 1, 2017
The non-monotonic beam energy dependence of the higher cumulants of net-proton fluctuations is a widely studied signature of the conjectured presence of a critical point in the QCD phase diagram. In this work we study the effect of resonance decays on crit ...
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ConferenceJournal of Physics Conference Series · February 8, 2017
We systematically compare an event-by-event transport+viscous hydrodynamics hybrid model to data from the RHIC beam energy scan using a general Bayesian method. We demonstrate how the inclusion of multistrange hadron observables affects the outcome of the ...
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ConferenceJournal of Physics Conference Series · February 8, 2017
We determine the dependence of important parameters for critical fluctuations on temperature and baryon chemical potential in the QCD phase diagram. The analysis is based on an identification of the fluctuations of the order parameter obtained from the Isi ...
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ConferenceActa Physica Polonica B, Proceedings Supplement · January 1, 2017
In this article, we present results obtained when fluid dynamical fluctuations are included in relativistic 3+1 dimensional viscous fluid dynamics. We discuss effects of the interactions of fluctuations due to nonlinearities and the cutoff dependence. ...
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ConferenceActa Physica Polonica B, Proceedings Supplement · January 1, 2017
We investigate the collision energy dependence of shear viscosity over the entropy density ratio η/=s in Au+Au collisions at √ sNN = 19:6, 39, and 62.4 GeV, using Bayesian statistical analysis and Gaussian process emulators to explore the full input parame ...
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ConferenceProceedings of Science · January 1, 2017
The impact of non-equilibrium effects on the dynamics of heavy-ion collisions is investigated by comparing a non-equilibrium transport approach, the Parton-Hadron-String-Dynamics (PHSD), to a 2D+1 viscous hydrodynamical model, which is based on the assumpt ...
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ConferenceProceedings of Science · January 1, 2017
We present the latest results on the collision energy dependence of ?/s, obtained from a Bayesian model-to-data analysis of UrQMD + viscous hydrodynamics hybrid model to RHIC beam energy scan data for Au+Au collisions at 19.6, 39 and 62.4 GeV. Changes in t ...
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Journal ArticleNuclear Physics A · December 1, 2016
We study the medium modification of heavy quarks produced in heavy-ion collisions. The evolution of heavy quarks inside the QGP is described using a modified Langevin framework that simultaneously incorporates their collisional and radiative energy loss. W ...
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Journal ArticlePhysical Review C · August 12, 2016
We quantitatively estimate properties of the quark-gluon plasma created in ultrarelativistic heavy-ion collisions utilizing Bayesian statistics and a multiparameter model-to-data comparison. The study is performed using a recently developed parametric init ...
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Journal ArticleNuclear and Particle Physics Proceedings · July 1, 2016
We investigate the heavy flavor dynamics in the quark-gluon plasma (QGP) medium created in p-Pb collisions at the CERN Large Hadron Collider (LHC). In the (3+1)-dimensional viscous hydrodynamics model describing QGP medium, the dynamics of heavy quarks are ...
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Journal ArticleIEEE transactions on visualization and computer graphics · January 2016
An ensemble is a collection of related datasets, called members, built from a series of runs of a simulation or an experiment. Ensembles are large, temporal, multidimensional, and multivariate, making them difficult to analyze. Another important challenge ...
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Journal ArticleComputer Physics Communications · January 1, 2016
The iEBE-VISHNU code package performs event-by-event simulations for relativistic heavy-ion collisions using a hybrid approach based on (2+1)-dimensional viscous hydrodynamics coupled to a hadronic cascade model. We present the detailed model implementatio ...
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ConferenceIs and T International Symposium on Electronic Imaging Science and Technology · January 1, 2016
Ensembles are large, multidimensional, multivariate datasets generated in areas like physical and natural science to study real-world phenomena. Simulations or experiments are run repeatedly with slightly different initial parameters, producing members of ...
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Journal ArticlePhysical Review C Nuclear Physics · November 20, 2015
We study the nuclear modification of angular and momentum correlations between heavy quark pairs in ultrarelativistic heavy-ion collisions. The evolution of heavy quarks inside the thermalized medium is described via a modified Langevin approach that incor ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · November 17, 2015
We study the effects of initial state fluctuations on the dynamical evolution of heavy quarks inside a quark-gluon plasma (QGP) created in relativistic heavy-ion collisions. The evolution of heavy quarks in QGP matter is described utilizing a modified Lang ...
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Journal ArticlePhysical Review C Nuclear Physics · August 14, 2015
We construct a theoretical framework to describe the evolution of heavy flavors produced in relativistic heavy-ion collisions. The in-medium energy loss of heavy quarks is described using our modified Langevin equation that incorporates both quasielastic s ...
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Journal ArticlePhysical Review C Nuclear Physics · July 6, 2015
We introduce a new parametric initial-condition model for high-energy nuclear collisions based on eikonal entropy deposition via a "reduced-thickness" function. The model simultaneously describes experimental proton-proton, proton-nucleus, and nucleus-nucl ...
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Journal ArticlePhysical Review C Nuclear Physics · May 22, 2015
We systematically compare an event-by-event heavy-ion collision model to data from the CERN Large Hadron Collider. Using a general Bayesian method, we probe multiple model parameters including fundamental quark-gluon plasma properties such as the specific ...
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Journal ArticlePhysical Review C Nuclear Physics · February 24, 2015
We utilize the parton cascade model to study the evolution of charm quarks propagating through a thermal brick of QCD matter. We determine the energy loss and the transport coefficient q for charm quarks. The calculations are done at a constant temperature ...
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Journal ArticlePhysical Review C Nuclear Physics · January 20, 2015
We investigate the elliptic and the triangular flow of heavy mesons in ultrarelativistic heavy-ion collisions at the BNL Relativistic Heavy-Ion Collider and the CERN Large Hadron Collider (LHC). The dynamics of heavy quarks is coupled to the locally therma ...
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Journal ArticleNuclear Physics A · December 1, 2014
We study heavy flavor evolution and hadronization in relativistic heavy-ion collisions. The in-medium evolution of heavy quarks is described using our modified Langevin framework that incorporates both collisional and radiative energy loss mechanisms. The ...
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Journal ArticleNuclear Physics A · November 1, 2014
We investigate the charm-quark propagation in the QGP media produced in ultrarelativistic heavy-ion collisions at RHIC and the LHC. Purely collisional and radiative processes lead to a significant suppression of final D-meson spectra at high transverse mom ...
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Journal ArticleNuclear Physics A · November 1, 2014
We study heavy flavor evolution in the quark-gluon plasma matter and the subsequent hadron gas created in ultrarelativistic heavy-ion collisions. The motion of heavy quarks inside the QGP is described using our modified Langevin framework that incorporates ...
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Journal ArticleNuclear Physics A · November 1, 2014
We argue that the domain structure of deconfined QCD matter, which can be inferred from the properties of the Polyakov loop, can simultaneously explain the two most prominent experimental features of the quark-gluon plasma, namely its near ideal fluid prop ...
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Journal ArticlePhysical Review C - Nuclear Physics · March 31, 2014
Using the vishnu hybrid model that couples (2+1)-dimensional viscous hydrodynamics to a microscopic hadronic transport model, we calculate the multiplicity, pT spectra, and elliptic flow for pions, kaons, and protons in 2.76A TeV Pb+Pb collisions, using mc ...
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Journal ArticleJournal of Physics Conference Series · January 1, 2014
Charm quarks are produced mainly in the pre-equilibrium stage of heavy ion collision and serve as excellent probes entering the thermalized medium. They come out with altogether different momenta and energies and fragments into D-mesons and decay into non- ...
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Journal ArticlePhysical Review C Nuclear Physics · October 11, 2013
We study the dynamics of energy loss and flow of heavy quarks produced in ultrarelativistic heavy-ion collisions within the framework of a Langevin equation coupled to a (2+1)-dimensional viscous hydrodynamic model that simulates the spacetime evolution of ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · August 1, 2013
Within the framework of the Langevin equation, we study the energy loss of heavy quarks due to quasi-elastic multiple scatterings in a quark-gluon plasma created by relativistic heavy-ion collisions. We investigate how the initial configuration of the quar ...
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Journal ArticleNuclear Physics A · May 2, 2013
We present a study of the dijet suppression at RHIC using the parton cascade model. We examine the modification of the dijet asymmetry A j and the fragmentation distributions z and j T in terms of: q̂; the path length of leading and su ...
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ConferenceJournal of Physics Conference Series · January 1, 2013
We study heavy quark energy loss in a hot and dense nuclear matter in the framework of Langevin equation coupled to a (2+1)-dimensional hydrodynamic model. The classical Langevin framework is modified such that both quasi-elastic scattering and gluon radia ...
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Journal ArticleJournal of Physics Conference Series · January 1, 2013
We study heavy quark energy loss and thermalization in hot and dense nuclear medium. The diffusion of heavy quarks is calculated via a Langevin equation, both for a static medium as well as for a quark-gluon plasma (QGP) medium generated by a (3+1)-dimensi ...
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Journal ArticleCentral European Journal of Physics · May 16, 2012
We utilize an event-by-event relativistic hydrodynamic calculation performed at a number of different incident beam energies to investigate the creation of hot and dense QCD matter near the critical point. Using state-of-the-art analysis and visualization ...
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Journal ArticleAip Conference Proceedings · May 10, 2012
Triangular flow has been shown to be an interesting new observable to gain insights about the properties of hot and dense strongly interacting matter as it is produced in heavy ion collisions at RHIC and LHC. The potential of triangular flow for constraini ...
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Journal ArticleAip Conference Proceedings · May 10, 2012
We have implemented the LPM effect into a microscopic transport model with partonic degrees of freedom by following the algorithm of Zapp & Wiedemann. The Landau-Pomeranchuk-Migdal (LPM) effect is a quantum interference process that modifies the emission o ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · May 1, 2012
Experimental data from the Relativistic Heavy-Ion Collider suggest that the quark gluon plasma behaves almost like an ideal fluid. Due to its short lifetime, many QGP properties can only be inferred indirectly through a comparison of the final state measur ...
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Journal ArticleProceedings of SPIE--the International Society for Optical Engineering · February 2012
An ensemble is a collection of related datasets. Each dataset, or member, of an ensemble is normally large, multidimensional, and spatio-temporal. Ensembles are used extensively by scientists and mathematicians, for example, by executing a simulation repea ...
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Journal ArticleProceedings of SPIE--the International Society for Optical Engineering · January 2012
We present three extensions to parallel coordinates that increase the perceptual salience of relationships between axes in multivariate data sets: (1) luminance modulation maintains the ability to preattentively detect patterns in the presence of overplott ...
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Journal ArticleProceedings of SPIE--the International Society for Optical Engineering · January 2012
By definition, an ensemble is a set of surfaces or volumes derived from a series of simulations or experiments. Sometimes the series is run with different initial conditions for one parameter to determine parameter sensitivity. The understanding and identi ...
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Journal ArticleProgress of Theoretical Physics Supplement · January 1, 2012
This article highlights topics in High Energy-Density QCD of relevance to the physics of ultra-relativistic heavy-ion collisions. ...
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Journal ArticlePhysical Review C Nuclear Physics · December 2, 2011
We study the thermalization process of charm quarks in hot and dense matter. The diffusion of heavy quarks is calculated via a Langevin equation, both for a static medium as well as for a quark-gluon plasma (QGP) medium generated by a (3+1)-dimensional hyd ...
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Journal ArticlePhysical Review C Nuclear Physics · November 14, 2011
The longitudinal long-range correlations of the triangular flow event-plane angles are calculated in a Boltzmann + hydrodynamics hybrid approach. The potential to disentangle different energy deposition scenarios is explored by utilizing two different tran ...
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Journal ArticleNuclear Physics A · July 15, 2011
Parton Cascade Models which describe the full time-evolution of a system of quarks and gluons using pQCD interactions are ideally suited for the description of jet production, including the emission, evolution and energy-loss of the full parton shower in a ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · April 1, 2011
In this paper we conduct a systematic study of the granularity of the initial state of hot and dense QCD matter produced in ultra-relativistic heavy-ion collisions and its influence on bulk observables like particle yields, mT spectra and ellipt ...
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Journal ArticleNuclear Physics A · March 15, 2011
Turbulent color fields, which can arise in the early and late stages of relativistic heavy ion collisions, may contribute significantly to the transport processes in the matter created in these collisions. We review the theory of these anomalous transport ...
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Journal ArticlePhysical Review C Nuclear Physics · January 31, 2011
We investigate the contribution of medium-modified jets and initial state fluctuations to the asymmetry in charged-particle production with respect to the reaction plane. This asymmetry has been suggested as a compelling signature for the chiral magnetic e ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · January 3, 2011
Among the key features of hot and dense QCD matter produced in ultra-relativistic heavy-ion collisions at RHIC is its very low shear viscosity, indicative of the properties of a near-ideal fluid, and a large opacity demonstrated by jet energy loss measurem ...
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Journal ArticlePhysical Review C Nuclear Physics · December 13, 2010
We develop a systematic framework for the study of the initial collision geometry fluctuations in relativistic heavy-ion collisions and investigate how they evolve through different stages of the fireball history and translate into final-particle momentum ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · October 1, 2010
We study the time evolution of a high-momentum gluon or quark propagating through an infinite, thermalized, partonic medium utilizing a Boltzmann equation approach. We calculate the collisional energy loss of the parton, study its temperature and flavor de ...
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Journal ArticlePhysical Review C Nuclear Physics · January 1, 2010
The first calculation of triangular flow ν3 in Au+Au collisions at √sNN = 200A GeV from an event-by-event (3 + 1) d transport+hydrodynamics hybrid approach is presented. As a response to the initial triangularity Ie{cyrillic, ukrainian}3 of the ...
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Journal ArticleNuclear Physics A · November 1, 2009
The presence of a critical point in the QCD phase diagram can deform the trajectories describing the evolution of the expanding fireball in the μB - T phase diagram. The deformation of the hydrodynamic trajectories will change the transverse vel ...
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Journal ArticleNuclear Physics A · November 1, 2009
Ultrarelativistic heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC) are thought to have produced a state of matter called the quark-gluon plasma, characterized by a very small shear-viscosity to entropy-density ratio η / s, near the lower ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · June 15, 2009
The recombination model as a model for hadronization from a quark-gluon plasma has been recently revived since it has advantages in explaining several important features of the final state produced in heavy-ion collisions at the RHIC, such as the constitue ...
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Journal ArticlePhysical review letters · May 2009
Ultrarelativistic heavy-ion collisions at the Brookhaven National Laboratory Relativistic Heavy Ion Collider (RHIC) are thought to have produced a state of matter called the quark-gluon plasma, characterized by a very small shear-viscosity to entropy-densi ...
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Journal ArticleActa Physica Polonica B · April 1, 2009
The current status of the modeling of relativistic heavy-ion collisions with 3+1D hydrodynamic and hybrid models is reviewed. Particular emphasis is placed in the use of hydrodynamics as a "standard medium", enabling the calculation of rare probe - medium ...
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Journal ArticlePhysical Review C Nuclear Physics · February 2, 2009
We perform a systematic comparison of three different jet energy-loss approaches. These include the Armesto-Salgado-Wiedemann scheme based on the approach of Baier-Dokshitzer-Mueller-Peigne-Schiff and Zakharov (BDMPS-Z/ASW), the higher twist (HT) approach ...
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Journal ArticleEuropean Physical Journal C · January 1, 2009
Ultrarelativistic heavy-ion collisions at the Relativistic Heavy-Ion Collider (RHIC) are thought to have created a Quark-Gluon Plasma, characterized by a very small shear viscosity to entropy density ratio η/s, close to the lower bound predicted for that q ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · October 1, 2008
We utilize a 3D hydrodynamic model to provide the medium evolution for a systematic comparison of jet energy-loss calculations in the BDMPS/ASW, HT and AMY approaches. We find that the parameters of all three calculations can be adjusted to provide a good ...
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Journal ArticlePhysical review letters · September 2008
The presence of a critical point in the QCD phase diagram can deform the trajectories describing the evolution of the expanding fireball in the mu_B-T phase diagram. If the average emission time of hadrons is a function of transverse velocity, as microscop ...
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Journal ArticlePhysical Review C Nuclear Physics · December 26, 2007
The nuclear modification factor RAA for π0 production in Au+Au collisions at s=200A GeV is calculated and studied at high transverse momenta pT. The soft thermalized nuclear medium is described within the framework of relativistic ideal three-dimensional h ...
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Journal ArticlePhysical Review C Nuclear Physics · October 23, 2007
The modification of the single inclusive spectrum of high transverse momentum (pT) pions emanating from an ultrarelativistic heavy-ion collision is investigated. The deconfined sector is modeled using a full three-dimensional (3-D) ideal fluid dynamics sim ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · August 1, 2007
We argue that an expanding quark-gluon plasma has an anomalous viscosity, which arises from interactions with dynamically generated colour fields. The anomalous viscosity dominates over the collisional viscosity for large velocity gradients or weak couplin ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · August 1, 2007
We utilize a 3D hybrid hydro+micro model for a comprehensive and consistent description of soft and hard particle production in ultra-relativistic heavy-ion collisions at RHIC. In the soft sector we focus on the dynamics of (multi-) strange baryons, where ...
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Journal ArticlePhysical review letters · July 2007
The nearside distribution of particles at intermediate transverse momentum, associated with a high momentum trigger hadron produced in a high energy heavy-ion collision, is broadened in rapidity compared with the jet cone. This broadened distribution is th ...
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Journal ArticleInternational Journal of Modern Physics E · April 1, 2007
In summary, we have introduced a hybrid macroscopic/microscopic transport approach, combining a newly developed relativistic 3+1 dimensional hydrodynamic model for the early deconfined stage of the reaction and the hadronization process with a microscopic ...
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Journal ArticlePhysical Review C Nuclear Physics · March 23, 2007
We study the radiative energy loss of hard partons in a soft medium in the multiple soft scattering approximation. The soft medium is described by a 3D hydrodynamical model and we treat the averaging over all possible parton paths through the medium withou ...
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Journal ArticleNuclear Physics A · February 15, 2007
We calculate the production of high energy photons from Compton and annihilation processes as well as fragmentation off quarks in the Parton Cascade Model. The multiple scattering of partons is seen to lead to substantial production of high energy photons, ...
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Journal ArticlePhysical Review C Nuclear Physics · January 1, 2007
We introduce a combined, fully three-dimensional macroscopic/microscopic transport approach employing relativistic 3D hydrodynamics for the early, dense, deconfined stage of the reaction and a microscopic nonequilibrium model for the later hadronic stage w ...
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Journal ArticleEuropean Physical Journal C · January 1, 2007
We introduce a combined fully three-dimensional macroscopic/microscopic transport approach employing relativistic 3D-hydrodynamics for the early, dense, deconfined stage of the reaction and a microscopic non-equilibrium model for the later hadronic stage w ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · December 1, 2006
In this write-up of my SQM 2006 Theory Summary talk I focus on a selection of key contributions which I consider to have a large impact on the current status of the field of strangeness physics or which may have the potential to significantly advance stran ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · December 1, 2006
Flavour probes depend on the transport properties of the quark-gluon plasma. An expanding quark-gluon plasma has an anomalous viscosity, which arises from interactions with dynamically generated colour fields. The anomalous viscosity dominates over the col ...
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Journal ArticleAip Conference Proceedings · December 1, 2006
We present the results of a novel macroscopic/microscopic hybrid model, using a fully 3D non-boostinvariant hydrodynamic calculation for the deconfined phase coupled with with a non-equilibrium microscopic transport model (UrQMD) for the hadronic phase at ...
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Journal ArticleJournal of Physics Conference Series · November 1, 2006
Parton recombination models have been very successful in explaining data taken at RHIC on hadron spectra and emission patterns in Au+Au collisions at transverse momenta above 2 GeV/c, which have exhibited features which could not be understood in the frame ...
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Journal ArticleProgress of Theoretical Physics · October 1, 2006
We derive an expression for the anomalous viscosity in an anisotropically expanding quark-gluon-plasma, which arises from interactions of thermal partons with dynamically generated color fields. The anomalous viscosity dominates over the collisional viscos ...
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Journal ArticleNuclear Physics A · August 7, 2006
We describe how parton recombination can address the recent measurement of dynamical jet-like two particle correlations. In addition we discuss the possible effect realistic light-cone wave-functions including higher Fock-states may have on the well-known ...
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Journal ArticleNuclear Physics A · August 7, 2006
We present a 3-D hydro + cascade model in which viscosity and a realistic freezeout process for the hadronic phase are taken into account. We compare our results to experimental data and discuss the finite state interaction effects on physical observables. ...
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Journal ArticlePhysical review letters · June 2006
We argue that an expanding quark-gluon plasma has an anomalous viscosity, which arises from interactions with dynamically generated color fields. We derive an expression for the anomalous viscosity in the turbulent plasma domain and apply it to the hydrody ...
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · January 26, 2006
We study the role played by the Landau-Pomeranchuk-Migdal (LPM) effect in relativistic collisions of hadrons and heavy nuclei, within a parton cascade model. We find that the LPM effect strongly affects the gluon multiplication due to radiation and conside ...
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Journal ArticleActa Physica Hungarica Series A Heavy Ion Physics · December 5, 2005
We discuss the hadron production in heavy ion collisions by the recombination and fragmentation model. We propose the elliptic flow as the useful tool for exploring final interactions for resonances, hadron structure for exotic particles and phase structur ...
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Journal ArticleActa Physica Hungarica Series A Heavy Ion Physics · December 5, 2005
Transverse hadron spectra from proton-proton, proton-nucleus and nucleus-nucleus collisions from 2 A·GeV to 21.3 A·TeV are investigated within two independent transport approaches (HSD and UrQMD). For central Au+Au (Pb+Pb) collisions at energies above E
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · July 7, 2005
Quark counting rules derived from recombination models agree well with data on hadron production at intermediate transverse momenta in relativistic heavy-ion collisions. They convey a simple picture of hadrons consisting only of valence quarks. We discuss ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · June 1, 2005
Strange quark production in Au-Au collisions at RHIC is studied in the framework of the parton cascade model (PCM). The yields of (anti-) strange quarks for three production scenarios - primary-primary scattering full scattering and full production - are c ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · June 1, 2005
I discuss strangeness as a tool for studying the reaction and hadronization dynamics of relativistic heavy-ion collisions at RHIC. In particular, I focus on quark-number scaling of elliptic flow as a tool to determine the nature of hadronization as well as ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · April 1, 2005
We discuss hadron production in relativistic heavy-ion collisions in the framework of the recombination and fragmentation model. We propose elliptic flow as a useful tool for exploring final interactions of resonances, the hadron structure of exotic partic ...
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Journal ArticlePhysical review letters · April 2005
We discuss different sources of hadron correlations in relativistic heavy ion collisions. We show that correlations among partons in a quasithermal medium can lead to the correlated emission of hadrons by quark recombination and argue that this mechanism o ...
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Journal ArticlePhysical Review C Nuclear Physics · January 1, 2005
We explore possible ways of explaining the net charge event-by-event fluctuations in Au+Au collisions observed in experiments at the Relativistic Heavy Ion Collider within a quark recombination model. We estimate the number of quarks at recombination and t ...
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Journal ArticlePhysical review letters · October 2004
We calculate the two-body correlation function of direct photons produced in central Au+Au collisions at the Relativistic Heavy-Ion Collider. Our calculation includes contributions from the early preequilibrium phase in which photons are produced via hard ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · August 1, 2004
We present an analysis of the net baryon number rapidity distribution and of direct photon emission in the framework of the parton cascade model. ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · July 1, 2004
We investigate strange quark production in Au-Au collisions at RHIC in the framework of the parton cascade model (PCM). The yields of (anti-) strange quarks for three production scenarios - primary-primary scattering, full scattering, and full production - ...
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · March 11, 2004
We study the elliptic flow v2 of multi-strange hadrons such as the φ, Ξ and Ω as a function of transverse momentum in the recombination and fragmentation model and compare to a standard hydrodynamic calculation. We find that the measurement of v ...
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Journal ArticlePhysical Review C Nuclear Physics · January 1, 2004
We investigate hadron production as well as transverse hadron spectra from proton-proton, proton-nucleus, and nucleus-nucleus collisions from 2A GeV to 21.3A TeV within two independent transport approaches, i.e., hadron-string dynamics (HSD) and ultrarelat ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · January 1, 2004
We discuss net charge event-by-event fluctuations in microscopic transport models with emphasis on hadronization schemes and rescattering effects. ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · January 1, 2004
We show that hadron production in relativistic heavy-ion collisions at transverse momenta larger than 2 GeV/c can be explained by the competition of two different hadronization mechanisms. Above 5 GeV/c hadron production can be described by fragmentation o ...
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Journal ArticlePhysical Review C Nuclear Physics · January 1, 2004
We propose the measurement of the elliptic flow of hadron resonances at the Relativistic Heavy Ion Collider as a tool to probe the amount of hadronic final state interactions for resonances at intermediate and large transverse momenta. This can be achieved ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · October 1, 2003
We calculate the transverse momentum distribution of net quarks (quarks minus antiquarks) in Au+Au collisions at the Relativistic Heavy Ion Collider in the framework of the parton cascade model at two different rapidities. Parton re-scattering and fragment ...
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Journal ArticlePhysical review letters · August 2003
We calculate the net-baryon rapidity distribution in Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC) in the framework of the parton cascade model (PCM). Parton rescattering and fragmentation leads to a substantial increase in the net-baryon ...
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Journal ArticlePhysical review letters · May 2003
We argue that the emission of hadrons with transverse momentum up to about 5 GeV/c in central relativistic heavy ion collisions is dominated by recombination, rather than fragmentation of partons. This mechanism provides a natural explanation for the obser ...
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Journal ArticleNuclear Physics A · March 10, 2003
We study the microscopic dynamics of quarks and gluons in relativistic heavy ion collisions in the framework of the Parton Cascade Model. We use lowest order perturbative QCD cross sections with fixed lower momentum cutoff p Tmin. We ...
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Journal ArticlePhysical review letters · February 2003
We calculate the production of high energy photons from Compton and annihilation processes as well as fragmentation off quarks in the parton cascade model. The multiple scattering of partons is seen to lead to a substantial production of high energy photon ...
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · January 9, 2003
We study the microscopic dynamics of quarks and gluons in relativistic heavy ion collisions in the framework of the Parton Cascade Model. We use lowest order perturbative QCD cross sections with fixed lower momentum cutoff PTmin. We c ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2003
We discuss hadron production in heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC). We argue that hadrons at transverse momenta [Formula Presented] are formed by recombination of partons from the dense parton phase created in central collis ...
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Journal ArticlePhysical Review C - Nuclear Physics · 2003
We discuss hadron production in heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC). We argue that hadrons at transverse momenta P T<5 GeV are formed by recombination of partons from the dense parton phase created in central collisions at ...
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Journal ArticlePhysical Review Letters · 2003
The net-baryon multiplicity density distributions in Au + Au collisions were calculated at 130 and 200 GeV center-of-mass energy per nucleon pair. The parton cascade model predicted a net-baryon excess at midrapidity in Au + Au collisions, which was in agr ...
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Journal ArticlePramana Journal of Physics · January 1, 2003
The current status of quark gluon plasma theory was reviewed. The ultra-relativistic heavy-ion collisions offered a unique opportunity to probe highly excited dense nuclear matter under controlled laboratory conditions. It was found that the development of ...
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Journal ArticlePhys. Rev. C, Rapid Communication · December 2002
We analyze the contribution of pQCD based semi-hard parton
(re)scattering to the reaction dynamics of relativistic
heavy-ion collisions at SPS and RHIC. While such processes
are able to account for the measured yield of high momentum
direct photons at SPS ...
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Journal ArticleJournal of Physics G: Nuclear and Particle Physics · July 1, 2002
The Ω+/Ω-ratio originating from string decays is predicted to be >1 in pp interaction at SPS energies. The anti-Ω dominance increases with decreasing beam energy. This surprising behaviour is caused by the combinatorics of quark-antiquark production in sma ...
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Journal ArticlePhysical Review Letters · May 20, 2002
The ω̄/ω ≡ ω+/ω- ratio in elementary proton-proton collisions in an unambiguous and sensitive probe for distinguishing particle production through the breakup of a color flux tube from statistical hadronization was presented. Results s ...
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Journal ArticlePhysical review letters · May 2002
The Omega/Omega ratio originating from string decays is predicted to be larger than unity in proton-proton interactions at SPS energies ( E(lab) = 160 GeV). The antiomega dominance increases with decreasing beam energy. This surprising behavior is caused b ...
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Journal ArticlePhysical review letters · February 2002
We calculate the kaon-interferometry radius parameters for high-energy heavy-ion collisions, assuming a first-order phase transition from a thermalized quark-gluon plasma (QGP) to a gas of hadrons. At high transverse momenta K(T) approximately 1 GeV/c dire ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · January 1, 2002
We make predictions for the kaon interferometry measurements in Au+Au collisions at the relativistic heavy ion collider (RHIC). A first-order phase transition from a thermalized quark-gluon plasma (QGP) to a gas of hadrons is assumed for the transport calc ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · January 1, 2002
Strangeness production in microscopic transport models for relativistic heavyion collisions from SIS to RHIC is reviewed: after a brief introduction into elementary strangeness production processes, the main emphasis is put on strangeness as an indicator o ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2002
We analyze the contribution of perturbative QCD based semihard parton (re)scattering to the reaction dynamics of relativistic heavy-ion collisions at SPS and RHIC. While such processes are able to account for the measured yield of high-momentum direct phot ...
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Journal ArticleActa Physica Hungarica New Series Heavy Ion Physics · December 1, 2001
Compelling evidence for the creation of a new form of matter has been claimed to be found in Pb+Pb collisions at SPS. We discuss the uniqueness of often proposed experimental signatures for quark matter formation in relativistic heavy ion collisions. It is ...
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Journal ArticlePhysical review letters · April 2001
We calculate the Gaussian radius parameters of the pion-emitting source in high-energy heavy-ion collisions, assuming a first-order phase transition from a thermalized quark-gluon plasma (QGP) to a gas of hadrons. Such a model leads to a very long-lived di ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · March 1, 2001
The equilibration of hot and dense nuclear matter produced in the central region in central Au + Au collisions at √s = 200 A GeV is studied within the microscopic transport model UrQMD. The pressure here becomes isotropic at t ≈ 5 fm c-1. Within ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · March 1, 2001
A novel state of matter has been hypothesized to exist during the early stage of relativistic heavy-ion collisions, with normal hadrons not appearing until several fin c-1 after the start of the reaction. Radial flow of multi-strange baryons is ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · March 1, 2001
The yields of strange particles are calculated with the ultrarelativistic quantum molecular dynamics model for p, Pb(158 A GeV)Pb collisions and compared with experimental data. The yields are enhanced in central collisions compared with proton-induced or ...
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Journal ArticlePhys. Rev. C · 2001
The equilibration of hot and dense nuclear
matter produced
in the central cell of central Au+Au
collisions at RHIC
($\sqrt{s}=200$ AGeV) energies is studied
within a
microscopic transport model. The pressure in
the cell
becomes isotropic at $t\approx 5$ fm ...
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Journal ArticlePhysical Review C Nuclear Physics · January 1, 2001
The equilibration of hot and dense nuclear matter produced in the central cell of central Au+Au collisions at √s=200A GeV is studied within a microscopic transport model. The pressure in the cell becomes isotropic at t≈5 fm/c after beginning of the collisi ...
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Journal ArticlePhysical Review C Nuclear Physics · January 1, 2001
We compute bremsstrahlung arising from the acceleration of individual charged baryons and mesons during the time evolution of high-energy Au + Au collisions at the Relativistic Heavy Ion Collider using a microscopic transport model. We elucidate the connec ...
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Journal ArticlePhysical review letters · September 2000
A novel state of matter has been hypothesized to exist during the early stage of relativistic heavy-ion collisions, with normal hadrons not appearing until several fm/c after the start of the reaction. To test this hypothesis, correlations between charges ...
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · July 13, 2000
The centrality dependence of the antiproton per participant ratio is studied in Pb(160 A GeV) + Pb reactions. Antiproton production in collisions of heavy nuclei at the CERN/SPS seems considerably enhanced as compared to conventional hadronic physics, give ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2000
We introduce a combined macroscopic-microscopic transport approach employing relativistic hydrodynamics for the early, dense, deconfined stage of the reaction and a microscopic nonequilibrium model for the later hadronic stage where the equilibrium assumpt ...
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Journal ArticlePhys. Rev. C · 2000
We study the local equilibrium in the central
V = 125 fm3
cell in heavy-ion collisions at energies from
10.7A GeV
(AGS) to 160A GeV (SPS) calculated in the
microscopic
transport model. In the present paper the
hadron yields and
energy spectra in the cell ...
Cite
Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2000
The ultrarelativistic quantum molecular dynamics model (UrQMD) is used to study global observables in central reactions of Au+Au at [Formula Presented] GeV at the Relativistic Heavy Ion Collider (RHIC). Strong stopping governed by massive particle producti ...
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Journal ArticlePhysical Review C Nuclear Physics · January 1, 2000
We study the local equilibrium in the central V = 125 fm3 cell in heavy-ion collisions at energies from 10.7/4 GeV (AGS) to 160A GeV (SPS) calculated in the microscopic transport model. In the present paper the hadron yields and energy spectra i ...
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Journal ArticlePhysical Review C - Nuclear Physics · 2000
The ultrarelativistic quantum molecular dynamics model (UrQMD) is used to study global observables in central reactions of Au+Au at √s = 200A GeV at the Relativistic Heavy Ion Collider (RHIC). Strong stopping governed by massive particle production is pred ...
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Journal ArticlePhysical Review C - Nuclear Physics · 2000
We introduce a combined macroscopic-microscopic transport approach employing relativistic hydrodynamics for the early, dense, deconfined stage of the reaction and a microscopic nonequilibrium model for the later hadronic stage where the equilibrium assumpt ...
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · December 30, 1999
Different treatments for the inclusion of higher-order perturbative QCD corrections in parton based transport models of relativistic heavy-ion collisions are studied and their influence on experimental observables is investigated. At RHIC, particle multipl ...
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Journal ArticleNuclear Physics A · December 27, 1999
The hypothesis of local equilibrium (LE) in relativistic heavy ion collisions at energies from AGS to RHIC is checked in the microscopic transport model. We find that kinetic, thermal, and chemical equilibration of the expanding hadronic matter is nearly r ...
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · December 23, 1999
The centrality dependence of (multi-)strange hadron abundances is studied for Pb(158 A GeV)Pb reactions and compared to p(158 GeV)Pb collisions. The microscopic transport model UrQMD is used for this analysis. The predicted Λ/π-, Ξ-/π ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · December 1, 1999
We study J/ψ reaction kinetics in hadronic environments. The validity of a thermal meson gas ansatz is tested by confronting it with an alternative, nonequilibrium scenario. Heavy-ion collisions are simulated in the framework of the microscopic transport m ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · November 1, 1999
We propose a novel formalism for simultaneously describing both the hard and soft parton dynamics in ultrarelativistic collisions of nuclei. The emission of gluons from the initially coherent parton configurations of the colliding nuclei and low-p1
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · September 1, 1999
Hadron-hadron (h-h) collisions at high energies are investigated in the ultra-relativistic quantum molecular dynamics (UrQMD) approach. This microscopic transport model describes the phenomenology of hadronic interactions at low and intermediate energies ( ...
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Journal Article · March 25, 1999
We compare microscopic transport model calculations to recent data on the
directed and elliptic flow of various hadrons in 2 - 10 A GeV Au+Au and Pb (158
A GeV) Pb collisions. For the Au+Au excitation function a transition from the
squeeze-out to an in-pla ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · March 1, 1999
A critical review on signatures of quark-gluon plasma (QGP) formation is given and the current (1998) experimental status is discussed. After giving an introduction to the properties of QCD matter in both, equilibrium and non-equilibrium theories, we focus ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · February 1, 1999
Thermodynamical variables and their time evolution are studied for central relativistic heavy ion collisions from 10.7 to 160 A GeV in the microscopic ultrarelativistic quantum molecular dynamics model (UrQMD). The UrQMD model exhibits drastic deviations f ...
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Journal ArticlePhys. Rev. C · 1999
We introduce a transport approach which
combines partonic
and hadronic degrees of freedom on an equal
footing and
discuss the resulting reaction dynamics. The
initial parton
dynamics is modeled in the framework of the
parton cascade
model, hadronization is ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 1999
The assumption of local equilibrium in relativistic heavy ion collisions at energies from [Formula Presented] GeV (AGS) up to [Formula Presented] GeV (SPS) is checked in the microscopic transport model. Dynamical calculations performed for a central cell i ...
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Journal ArticleNucl. Phys. · 1999
This paper contains the individual
contributions of all
speakers of the session on 'Last Call for
RHIC Predictions'
at Quark Matter 99, and a summary by the
convenor. ...
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Journal ArticlePhys. Rev. C · 1999
Using a microscopic transport model together
with a
coalescence after-burner, we study the
formation of
deuterons in Au + Au central collisions at
$\sqrt{s}=200
AGeV$. It is found that the deuteron
transverse momentum
distributions are strongly affected by ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 1999
Charmonium production and absorption in heavy ion collisions is studied with the ultrarelativisitic quantum molecular dynamics model. We compare the scenario of universal and time-independent color-octet dissociation cross sections with one of distinct col ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 1999
We analyze the hadronic freeze-out in ultrarelativistic heavy-ion collisions at Relativistic Heavy Ion Collider (RHIC) in a transport approach that combines hydrodynamics for the early, dense, deconfined stage of the reaction with a microscopic nonequilibr ...
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · January 1, 1999
We discuss a model for the space-time evolution of ultrarelativistic heavy-ion collisions which employs relativistic hydrodynamics within one region of the forward light-cone, and microscopic transport theory (i.e. UrQMD) in the complement. Our initial con ...
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · January 1, 1999
We study J/ψ suppression in AB collisions assuming that the charmonium states evolve from small, color transparent configurations. Their interaction with nucleons and nonequilibrated, secondary hadrons is simulated using the microscopic model UrQMD. The Dr ...
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · January 1, 1999
Local thermal and chemical equilibration is studied for central A + A collisions at 10.7-160 AGeV in the Ultrarelativistic Quantum Molecular Dynamics model (UrQMD). The UrQMD mode exhibits strong deviations from local equilibrium at the high density hadron ...
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Journal ArticlePhysical Review C Nuclear Physics · January 1, 1999
We propose to study the impact parameter dependence of the [Formula Presented] ratio in [Formula Presented] reactions. The [Formula Presented] ratio is a sensible tool to distinguish between hadronic cascade models and hydrodynamical models, which assume c ...
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Journal ArticleJ. Phys. G · 1999
We study J/psi dissociation processes in hadronic
environments. The validity of a thermal meson
gas ansatz is
tested by confronting it with an alternative,
nonequilibrium
scenario. Heavy ion collisions are simulated
in the
framework of the microscopic tran ...
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Journal ArticleProgress in Particle and Nuclear Physics · January 1, 1999
We analyze the reaction dynamics of central Pb+Pb collisions at 160 GeV/nucleon. First we estimate the energy density ∈ pile-up at mid-rapidity and calculate its excitation function: ∈ is decomposed into hadronic and partonic contributions. A detailed anal ...
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · January 1, 1999
We study the transverse expansion in central Pb + Pb collisions at the CERN SPS. Strong collective motion of hadrons can be created. This flow is mainly due to meson baryon rescattering. It allows to study the angular distribution of intermediate mass meso ...
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Journal ArticleProgress in Particle and Nuclear Physics · January 1, 1999
Nonequilibrium models (three-fluid hydrodynamics and UrQMD) are used to discuss the uniqueness of often proposed experimental signatures for quark matter formation in relativistic heavy ion collisions. It is demonstrated that these two models - although th ...
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Journal ArticlePhysical Review C - Nuclear Physics · 1999
Charmonium production and absorption in heavy ion collisions is studied with the ultrarelativisitic quantum molecular dynamics model. We compare the scenario of universal and time-independent color-octet dissociation cross sections with one of distinct col ...
Cite
Journal ArticlePhysical Review C - Nuclear Physics · 1999
Using a microscopic transport model together with a coalescence afterburner, we study the formation of deuterons in Au+Au central collisions at √s = 200A GeV. It is found that the deuteron transverse momentum distributions are strongly affected by the nucl ...
Cite
Journal ArticlePhysical Review C Nuclear Physics · January 1, 1999
We introduce a transport approach which combines partonic and hadronic degrees of freedom on an equal footing and discuss the resulting reaction dynamics. The initial parton dynamics is modeled in the framework of the parton cascade model, hadronization is ...
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Journal ArticlePhysical Review C - Nuclear Physics · 1999
We analyze the hadronic freeze-out in ultrarelativistic heavy-ion collisions at Relativistic Heavy Ion Collider (RHIC) in a transport approach that combines hydrodynamics for the early, dense, deconfined stage of the reaction with a microscopic nonequilibr ...
Cite
Journal ArticlePhysical Review C - Nuclear Physics · 1999
The assumption of local equilibrium in relativistic heavy ion collisions at energies from 10.7A GeV (AGS) up to 160A GeV (SPS) is checked in the microscopic transport model. Dynamical calculations performed for a central cell in the reaction are compared t ...
Cite
Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · December 3, 1998
We estimate the energy density ε pile-up at mid-rapidity in central Pb + Pb collisions from 2-200 GeV/nucleon. ε is decomposed into hadronic and partonic contributions. A detailed analysis of the collision dynamics in the framework of a microscopic transpo ...
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Journal ArticleNuclear Physics A · November 2, 1998
We estimate the energy density ∈ pile-up at mid-rapidity in central Pb+Pb collisions from 1 - 200 GeV/nucleon. ∈ is decomposed into hadronic and partonic contributions. A detailed analysis of the collision dynamics in the framework of a microscopic transpo ...
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Journal ArticlePhysical Review Letters · September 7, 1998
Ratios of hadronic abundances are analyzed for pp and nucleus-nucleus collisions at √s≈20 GeV using the microscopic ultrarelativistic quantum molecular dynamics transport model.Secondary interactions significantly change the primordial hadronic composition ...
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · September 3, 1998
We perform an event-by-event analysis of the transverse momentum distribution of final state particles in central Pb(160 AGeV) + Pb collisions within a microscopic non-equilibrium transport model (UrQMD). Strong influence of rescattering is found. The extr ...
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Journal ArticlePhysics Letters Section B Nuclear Elementary Particle and High Energy Physics · August 27, 1998
Local kinetic and chemical equilibration is studied for Au + Au collisions at 10.7 AGeV in the microscopic Ultrarelativistic Quantum Molecular Dynamics model (UrQMD). The UrQMD model exhibits dramatic derivations from equilibrium during the high density ph ...
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Journal ArticleNuclear Physics A · August 10, 1998
Recent reports on enhancements of intermediate and high mass muon pairs produced in heavy ion collisions have attracted much attention. To gain a better understanding of the content of the dilepton continuum, we study Drell-Yan production from secondary ha ...
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Journal ArticlePhys. Rev. C · 1998
Direct photon production in central Pb+Pb
collisions at
CERN-SPS energy is calculated within the
relativistic
microscopic transport model UrQMD, and within
distinctly
different versions of relativistic
hydrodynamics. We find
that in UrQMD the local momentu ...
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Journal ArticlePhys. Rev. Lett. · 1998
Ratios of hadronic abundances are analyzed
for pp and
nucleus-nucleus collisions at sqrt(s)=20 GeV
using the
microscopic transport model UrQMD. Secondary
interactions
significantly change the primordial hadronic
cocktail of the
system. A comparison to data ...
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Journal ArticlePhysical Review C Nuclear Physics · January 1, 1998
Equilibrium properties of infinite relativistic hadron matter are investigated using the ultrarelativistic quantum molecular dynamics (UrQMD) model. The simulations are performed in a box with periodic boundary conditions. Equilibration times depend critic ...
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Journal ArticleProg. Part. & Nucl. Phys. · 1998
In this paper, the concepts of microscopic
transport theory
are introduced and the features and
shortcomings of the most
commonly used ansatzes are discussed. In
particular, the
Ultrarelativistic Quantum Molecular Dynamics
(UrQMD)
transport model is descri ...
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Journal ArticlePhysical Review C Nuclear Physics · January 1, 1998
Dielectron mass spectra are examined for various nuclear reactions recently measured by the DLS Collaboration. A detailed description is given of all dilepton channels included in the transport model UrQMD 1.0, i.e., Dalitz decays of [Formula Presented] me ...
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Journal ArticleEuropean Physical Journal C · January 1, 1998
A study of secondary Drell-Yan production in nuclear collisions is presented for SPS energies. In addition to the lepton pairs produced in the initial collisions of the projectile and target nucleons, we consider the potentially high dilepton yield from ha ...
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Journal ArticleEuropean Physical Journal A · January 1, 1998
Basic problems of the semiclassical microscopic modelling of strongly interacting systems are discussed within the framework of Quantum Molecular Dynamics (QMD). This model allows to study the influence of several types of nucleonic interactions on a large ...
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Journal ArticlePhysical Review C Nuclear Physics · January 1, 1998
Direct photon production in central Pb+Pb collisions at CERN-SPS energy is calculated within the ultrarelativistic quantum molecular dynamics model (UrQMD), and within distinctly different versions of relativistic hydrodynamics. We find that in UrQMD the l ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · December 1, 1997
We present a new technique for observing the strangelet production in quark matter based on unlike particle correlations. A simulation is presented with a two-phase thermodynamical model. ...
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Journal ArticleNuclear Physics A · December 9, 1996
The behavior of hadronic matter at high baryon densities is studied within Ultra-relativistic Quantum Molecular Dynamics (UQMD). Baryonic stopping is observed for Au+Au collisions from SIS up to SPS energies. The excitation function of flow shows strong se ...
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Journal ArticleZeitschrift Fur Physik A Hadrons and Nuclei · December 1, 1995
The baryon density calculated at the collision center in relativistic heavy ion collisions is not representative for the density really probed by baryons in the high density collision phase. A decomposition into nucleon- and Δ-resonance densities yields av ...
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Journal ArticleZeitschrift Fur Physik A Hadrons and Nuclei · June 1, 1995
We present a microscopic calculation of neutron squeeze-out in relativistic heavy ion collisions at beam energies betweeen 400 and 1000 MeV/nucleon. After demonstrating the importance of the correct isospin treatment for the neutron to proton ratio, our ma ...
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Journal ArticleJournal of Physics G Nuclear and Particle Physics · December 1, 1994
Accurate impact parameter determination in a heavy-ion collision is crucial for almost all further analysis. We investigate the capabilities of an artificial neural network in that respect. First results show that the neural network is capable of improving ...
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Journal ArticlePhysics Letters B · September 8, 1994
We investigate the possibility of creating a new form of highly excited nuclear matter, Δ-matter, in heavy ion collisions at 1 GeV/nucleon. Enough Δ-resonances are produced to show collective effects. Maximum densities for the resonances around 50% ground ...
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Journal ArticlePhysics Letters B · April 1, 1993
The in-plane transverse momentum of pions in Ne(2A GeV)Pb and Au(2A GeV)Au collisions is analysed in the framework of the Vlasov-Uehling-Uhlenbeck model. The rapidity dependence of pion flow shows the opposite sign as the nucleon flow. The anticorrelation ...
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