Journal ArticlePhysical Review C · October 1, 2023
We calculate the cold neutron-deuteron (nd) capture cross section,σnd to next-to-next-to leading order (NNLO) using the model-independent approach of pionless effective-field theory [EFT(π)]. At leading order we find σnd=0.314±0.217 mb, while the experimen ...
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Journal ArticleAnnual Review of Nuclear and Particle Science · September 25, 2023
We present a method for ordering two-nucleon interactions based upon their scaling with the number of QCD colors, Nc, in the limit that Nc becomes large. Available data in the two-nucleon sector show general agreement with this ordering, indicating that th ...
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Journal ArticleFew-Body Systems · December 1, 2022
This is a collection of perspective pieces contributed by the participants of the Institute for Nuclear Theory’s Program on Nuclear Physics for Precision Nuclear Physics which was held virtually from April 19 to May 7, 2021. The collection represents the r ...
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Journal ArticlePhysical Review C · May 1, 2021
We extend, from operators with one derivative to operators with three derivatives, the analysis of two-body hadronic parity violation in a combined pionless effective field theory (EFTπ/) and large-Nc expansion, where Nc is the number of colors in quantum ...
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Journal ArticlePhysical Review C · May 1, 2021
The interpretation of experiments that search for neutrinoless double-β decay relies on input from nuclear theory. Cirigliano et al. [Phys. Rev. Lett. 120, 202001 (2018)PRLTAO0031-900710.1103/PhysRevLett.120.202001] recently showed that, for the light Majo ...
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Journal ArticlePhysical Review C · October 12, 2018
We analyze two-derivative two-nucleon interactions in a combined pionless effective field theory and large-Nc expansion. At leading order in the large-Nc expansion, relationships among low-energy constants emerge. We find these to be consistent with experi ...
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Journal ArticlePhysical Review C · May 8, 2018
There are instances of a missing sin2θW where we discuss the isotensor terms. Reference [1] is also missing this factor. The corrections are as follows: Eq. (9), (Formula Presented). scales as O (c) sin2 θ W, while Eqs. (18) and (19), (Formula Presented). ...
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Journal ArticlePhysical Review C · May 2, 2016
Polarization observables in neutron-deuteron scattering are calculated to next-to-next-to-next-to-leading order (N3LO) in pionless effective field theory (EFT¬π). At N3LO the two-body P-wave contact interactions are found to be important contributions to t ...
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ConferenceEPJ Web of Conferences · March 25, 2016
We discuss the calculation of polarization observables, including Ay, in nd scattering to next-to-next-to-next-to-leading order in pionless effective field theory. ...
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Journal ArticlePhysical Review C · February 19, 2016
The symmetries of the standard model dictate that for very low energies, where nucleon dynamics can be described in terms of a pionless effective field theory (EFT(π/)), the leading-order parity-violating nucleon-nucleon Lagrangian contains five independen ...
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Journal ArticlePhysical Review C - Nuclear Physics · June 12, 2014
We study the three-body systems of He3 and pd scattering and demonstrate, both analytically and numerically, that a new pd three-body force is needed at next-to-leading order in pionless effective field theory. We also show that at leading order these obse ...
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Journal ArticleProgress in Particle and Nuclear Physics · September 1, 2013
We review recent progress in the theoretical description of hadronic parity violation in few-nucleon systems. After introducing the different methods that have been used to study parity-violating observables we discuss the available calculations for reacti ...
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Journal Article · July 30, 2013
We discuss the scientific motivation, possible experiments, and beam
requirements for measurements of parity violation in photonuclear reactions at
an intensity upgraded HIGS facility, HIGS2. ...
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Journal ArticlePhysical Review D - Particles, Fields, Gravitation and Cosmology · July 15, 2013
The X(3872) has non-charmonium-like properties, such as decay processes that seem to violate isospin, and a mass that lies unexpectedly close to the D0 D̄0* threshold. An effective field theory that includes both charmoniumlike (short-distance) and molecule ...
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Journal ArticlePhysical Review D - Particles, Fields, Gravitation and Cosmology · May 5, 2011
Heavy hadron chiral perturbation theory (HHχPT) and XEFT are applied to the decays X(3872)→ψ(2S)γ and ψ(4040)→X(3872)γ under the assumption that the X(3872) is a molecular bound state of neutral charm mesons. In these decays the emitted photon energies are ...
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Journal ArticleNuclear Physics A · November 1, 2010
We consider parity-violating observables from the processes n→p→dγ and np → dγ. We perform calculations using pionless effective field theory both with and without explicit dibaryon fields. After combining these results with ones we have already obtained o ...
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ConferenceEPJ Web of Conferences · January 1, 2010
We briefly review the apparent experimental discrepancies that sustain interest in the field of lowenergy few-nucleon parity violation. We argue that it is not possible to determine whether present experimental measurements are consistent unless each is un ...
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Journal ArticleJournal of High Energy Physics · November 11, 2009
This paper explores whether Eguchi-Kawai reduction for gauge theories with adjoint fermions is valid. The Eguchi-Kawai reduction relates gauge theories in different numbers of dimensions in the large N limit provided that certain conditions are met. In pri ...
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Journal ArticlePhysical Review D - Particles, Fields, Gravitation and Cosmology · August 6, 2009
Both the mass (just below the D*0D̄0 threshold) and the likely quantum numbers (JPC=1++) of the X(3872) suggest that it is either a weakly bound hadronic "molecule" (X(3872)∼1/2[D*0D̄0+D̄*0D0]) or a virtual state of charmed mesons. Assuming the X(3872) is a w ...
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Journal ArticleNuclear Physics A · May 1, 2009
We analyze parity-violating nucleon-nucleon scattering at energies E < mπ2 / M using the effective field theory appropriate for this regime. The minimal Lagrangian for short-range parity-violating NN interactions is written in an operator basis that encode ...
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Journal ArticleChiral Dynamics 2006 - Proceedings of the 5th International Workshop on Chiral Dynamics, Theory and Experiment, CD 2006 · January 1, 2007
We apply heavy hadron chiral perturbation theory (HHChPT) to study the properties of the even- and odd-parity charmed-strange mesons. We find that the experimental masses and electromagnetic decay rates are consistent with HHChPT.We consider the hypothesis ...
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Journal ArticlePhysical Review D - Particles, Fields, Gravitation and Cosmology · August 1, 2005
We derive mass formulas for the ground state, JP=0- and 1-, and first excited even-parity, JP=0+ and 1+, charmed mesons including one-loop chiral corrections and O(1/mc) counterterms in heavy hadron chiral perturbation theory. We show that including these ...
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Journal ArticlePhysical Review D - Particles, Fields, Gravitation and Cosmology · 2004
Heavy-hadron chiral perturbation theory (HHχPT) is applied to the decays of the even-parity charmed strange mesons, Ds0(2317) and Ds1(2460). Heavy-quark spin-symmetry predicts the branching fractions for the three electromagnetic decays of these states to ...
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Journal ArticlePhysical Review D - Particles, Fields, Gravitation and Cosmology · January 1, 2003
We find expressions for the weak decay amplitudes of baryons containing two b quarks (or one b and one c quark—many relationships are the same) in terms of unknown reduced matrix elements. This project was originally motivated by the request of the Fermila ...
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Journal ArticleNuclear Physics A · April 9, 2001
We find the leading-order result for the anapole form factor of the deuteron using effective field theory. The momentum dependence of the anapole form factor is different from that of the matrix element of the strange currents in the deuteron, which may pr ...
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Journal ArticlePhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · January 1, 1999
Weak interactions are expected to induce a parity violating pion-nucleon coupling, hπNN(1). This coupling should be measurable in a proposed experiment to study the parity violating asymmetry Aγ in the process n→ + p → d + γ. We compute the leading depende ...
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Journal ArticlePhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · January 1, 1999
Considerable confusion in the literature about heavy baryon chiral perturbation theory, its convergence properties, and appropriate calculational techniques, make it timely to discuss the nonleptonic p-wave decays of the octet of baryons. We present model ...
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Journal ArticleNuclear Physics A · August 24, 1998
We explore the S-wave and P-wave amplitudes for NNK and ΛΛK interactions using chiral perturbation theory to script O sign(ms log ms). In contrast to the large corrections found in P-wave amplitudes in the nonleptonic decay of octet baryons, the NNK amplit ...
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Journal ArticleNuclear Physics A · January 1, 1998
Effective field theory, including pions, provides a consistent and systematic description of nucleon-nucleon strong interactions up to center-of-mass momentum p ∼ 300 MeV per nucleon. We describe the inclusion of hadronic parity violation into this effecti ...
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Journal ArticlePhysical Review C - Nuclear Physics · 1998
We calculate the leading contribution to the weak ΛΛK coupling in heavy baryon chiral perturbation theory, including the SU(3) breaking terms arising at one loop. This coupling gives the leading one-boson exchange amplitude for the process ΛΛ → Λn and is a ...
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Journal ArticleNuclear Physics A · January 1, 1998
The differential cross section for γ-deuteron Compton scattering is computed to next-to-leading order (NLO) in an effective field theory that describes nucleon-nucleon interactions below the pion production threshold. Contributions at NLO include the nucle ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 1998
We calculate the leading contribution to the weak [Formula Presented] coupling in heavy baryon chiral perturbation theory, including the SU(3) breaking terms arising at one loop. This coupling gives the leading one-boson exchange amplitude for the process ...
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Journal Article · August 18, 1995
The discrepancies found between S-wave and P-wave fits for hyperon decays are
reinvestigated using the heavy baryon chiral Lagrangian formalism.
The agreement is found to improve through the inclusion of previously omitted
diagrams. The S-waves are unaff ...
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Journal ArticleNuclear Physics, Section B · June 28, 1993
To explore further the role that QCD symmetries play on hadron dynamics, we discuss the radiative decay of the baryon decuplet to the baryon octet and compute the leading non-analytic SU(3) violating corrections induced at the one-loop level. In the limit ...
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Journal ArticlePhysics Letters B · April 29, 1993
We complete the leading contribution to the E2 M1 mixing ratio of the decay Δ→Nγ in heavy baryon chiral perturbation theory. We find the mixing ratio to be 4%{less-than or approximate}|δ E2 M1|{less-than or approximate}11%, much larger than estimates based ...
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Journal ArticlePhysics Letters B · November 21, 1991
We calculate the low energy effective hamiltonian for isovector (ΔI = 1) nuclear parity violation, including the effects of heavy quarks s, c and b. At the hadronic scale, the hamiltonian contains four-quark operators of the u, d, and s quarks whose coeffi ...
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Journal ArticleNuclear Physics, Section B · July 30, 1990
Strong-interaction corrections to the effective hamiltonian for weak radiative B-meson decay (i.e., B → Xsγ, where Xs denotes a strange hadronic final state) are calculated using the leading logarithmic approximation. The inclusive rate for decays B → Xsγ, ...
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Journal ArticlePhysics Letters B · February 25, 1988
The inclusive rate for decay of a B-meson to a hard photon and strange hadronic final states (i.e., B→γXs with Xs=K*, etc.), is likely to be dominated by short-distance physics which gives rise to an effective hamiltonian that is a magnetic-moment-type ope ...
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