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Anselm G. Vossen

Assistant Professor of Physics
Physics
Physics Building Room 188, PO Box 90305, Durham, NC 27708
Physics Building Room 188, Box 90305, Durham, NC 27708-0305
Office hours by appointment  

Selected Presentations & Appearances


Perspectives of SIDIS Measurements - The 16th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon · October 2023 Invited Talk University of Mainz, Germany, Mainz, Germany
Belle-II input for muon g-2 - Anomalies · March 2023 Invited Talk Stony Brook University/Simons Center for Geometry and Physics, Stony Brook, NY

For the past several years three key anomalies indicating lepton flavor universality violation (LFUV) have been getting a lot of attention as they each have a significance of more than 3 standard deviations. In the past year, in particular, important further progress has come from the LHCb experiment at CERN and current indications are that possibly in the next few months the Flavor Changing Neutral Current (FCNC) anomaly is very likely to move to over 4 standard deviations. In a similar vein the Fermilab g-2 Collaboration has recently indicated that they have been analyzing over an order of magnitude larger dataset beyond what they had used in their first report of 2021 which resulted in a 4.2 standard deviations from the Standard Model. Thus, unless the recently accumulated data uncovers some highly unexpected departure from the past, the muon g-2 anomaly is very likely to move to over 5 standard deviations. With this perspective in mind, the main objective of this workshop is to bring together experts, from both theoretical and experimental communities, working on various aspects and interpretations of the flavor anomalies. This can lead to new ideas in resolving the anomalies, as well as to future directions in the quest for new physics. The workshop will provide a unique platform to explore possible interconnections between flavor anomalies, issues in neutrino and dark sectors, and collider signals. Brainstorming all complementary aspects of the anomalies will help us unravel otherwise obscure links between seemingly disparate pieces of evidence of new physics.

emi-Inclusive DIS Measurements at the EIC - CTEQ-EICUG-HSF-MCNet Workshop on MCEGs for the EIC- MC4EIC 2022 · November 2022 Invited Talk CTEQ/EICUG/HSF/MCNET,

MC4EIC 2022, the next workshop on Monte Carlo event simulation for the EIC, is organized by the CTEQ collaboration, the EIC User Group, the HEP Software Foundation (HSF), and MCnet as a remote meeting from November 16–18.

Following up directly on previous workshops, we will start with in-depth reports on the precision of foreseen measurements and the related MC event generator (MCEG) needs. This will frame a discussion of MCEGs that are currently being developed for the EIC. We are asking developers to submit an abstract to present both the status of their project and the thrust of future R&D. The connection between formal QCD theory and its implementation in MCEGs will also be explored.

Developing precision simulation will require advancements in QCD theory and computational methods, as well as a close dialogue between experimentalists and theorists. We would like to conclude the workshop with a discussion on how to facilitate this dialogue and work together on cross-cutting aspects between theory and experiment in NHEP.

Recent results and future plans in the study of hadronization at Belle (II) and CLAS12 - 14th Conference on the Intersection of Particle and Nuclear Physics - CIPANP 2022 · August 2022 Invited Talk

CIPANP is a conference series designed to explore common areas of interest to scientists working in elementary particle physics, nuclear physics, nuclear and particle astrophysics, and cosmology. Topics include research focused on the study of fundamental interactions, elementary particles, nucleons and nuclei, astrophysical phenomena, and cosmic rays. In many cases, these distinct areas are attempting to answer the same fundamental questions about our universe. Experiments in each area typically also require input from the other areas to properly extract and interpret results from their data. CIPANP brings these communities together every three years in a unique setting that fosters collaboration among these scientific disciplines.

QCD Program at Belle II - QCD@Work - International Workshop on QCD - Theory and Experiment · June 2022 Invited Talk INFN ,
ragmentation and 3D Momentum Imaging" - HUGS Summer School · May 2022 Lecture JLab,
Fragmentation Function Measurements - MC4EIC: Monte Carlo event simulation for the EIC · November 2021 Invited Talk CTEQ-EICUG, online
TMD FFs, experimental review - INT Virtual Workshop: Fragmentation Functions 2021 · November 2021 Invited Talk INT, Physics Department, University of Washington, online
Measurements of inclusive cross-sections and azimuthal asymmetries of light charged hadrons at Belle - XXVIII International Workshop on Deep-Inelastic Scattering and Related Subjects · April 2021 International Meeting or Conference Stony Brook University, online
SIDIS, Jets and TMDs - Joint Argonne and CFNS Workshop · March 2021 Invited Talk Argonne National Lab, CFNS Stony Brook, online
Fragmentation functions and lambda(c) production in e+e- - Polarization Measurements in ee ep, pp and heavy ion collisions · December 2020 Invited Talk IJCLab Orsay, France,
Jets in e+e- - Jets for 3D Imaging · November 2020 Invited Talk UCR/BNL,
Insights from and prospects for Belle and JLab - 2020 Fall Meeting of the Division of Nuclear Physics of the American Physical Society · November 2020 Invited Talk FRIB/MSU,
Hadronization with polarization degrees of freedom - Correlations in Partonic and Hadronic Interactions (CPHI 2020) · February 2020 Invited Talk CERN, CERN
Seminar: Novel experimental probes of QCD in pp , SIDIS and e + e − annihilation · November 2019 Other University of North Carolina, Wilmington, Wilmington, NC
Results on light quark fragmentation from Belle - 2019 Fall Meeting of the APS Division of Nuclear Physics · October 2019 International Meeting or Conference APS, Crystal City, Va
Fragmentation at the EIC - 9th International Conference on Physics Opportunities at an ElecTron-Ion-Collider (POETIC 2019) · September 2019 Invited Talk Berkeley Lab, Berkeley, CA
Fragmentation Functions - The 11th Workshop on Hadron Physics in China and Opportunities Worldwide · August 2019 Invited Talk Nanjin U, Tianjing, China
"Experimental results on quark-gluon correlations - Workshop of the APS Topical Group on Hadronic Physics · April 2019 International Meeting or Conference GHP/APS, Denver, Co
Seminar: Novel experimental probes of QCD in SIDIS and e+e− annihilation - Nuclear Seminar UKY · April 2019 Other University of Kentucky, Lexington, KY
Di-hadron correlations in SIDIS at CLAS12 - 5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan · October 2018 International Meeting or Conference APS/JPS, Waikoloa, Hi
Di-hadron and polarized lambdas as novel probes of the nucleon structure - INT 18-3 · October 2018 Invited Talk INT, UW, Seattle, Wa
Recent experimental results and outlook from e+e- annihilation - Quantum Entanglement at Collider Energies · September 2018 Invited Talk SUNY Stony Brook, Stony Brook, NY
Hadron Structure Physics - National Nuclear Physics Summer School, · June 2018 Lecture Yale University, New Haven, Ct
Light Quark Fragmentation Studies at the B-Factories - CIPANP 2018 - Thirteenth Conference on the Intersections of Particle and Nuclear Physics · May 2018 Invited Talk Palm Springs, Ca
"Recent results and prospects for hadronic physics at Belle and Belle II - Lightcone 2018 · May 2018 Invited Talk Jefferson Lab, Newport News, Va
First Collisions at Belle II - CIPANP 2018 - Thirteenth Conference on the Intersections of Particle and Nuclear Physics · May 2018 International Meeting or Conference Palm Springs, Ca
Novel Experimental Probes of QCD in SIDIS and e+e− Annihilation", - CIPANP 2018 - Thirteenth Conference on the Intersections of Particle and Nuclear Physics · May 2018 International Meeting or Conference Palm Springs, Ca

Service to the Profession


Co-Organizer - Joint "20th International Workshop on Hadron Structure and Spectroscopy" and 5th "Correlations in Partonic and Hadronic Interactions" · September 2024 Event/Organization Administration Yerevan, Armenia

The four day long joint "20th International Workshop on Hadron Structure and Spectroscopy" and 5th workshop on "Correlations in Partonic and Hadronic Interactions" (IWHSS-CPHI-2024) will take place in Yerevan, Armenia, from September 30th to October 4th, 2024.

IWHSS-2024 is the 20th workshop in the series of annual workshops on Hadron Structure and Spectroscopy, with most recent editions being the IWHSS-2023 (Prague, Czechia) and IWHSS-2022 (CERN, Switzerland).

CPHI-2024 is the 5th workshop in the series of bi-annual workshops on Correlations in Partonic and Hadronic Interactions, with most recent editions being the CPHI-2022 (Duke University, US) and CPHI-2020 (CERN, Switzerland).

The scientific programme of the joint workshop will be focused on the following topics:

Spin and 3D Structure Structure of the Nucleon
TMDs, GPDs and GTMDs
Fragmentation and Fracture Functions
Fixed Target and Collider Experiments
Meson Structure and Spectroscopy
Search for Exotics and Baryon Resonaces
Confinement QCD and fundamental symmetries
Dark matter/dark photon searches
Future Measurements and Experimental proposals
One of the sessions of the workshop will be dedicated to the 50ths anniversary of the "November revolution in particle physics".

Co-Convener track AI/ML for ePIC and Beyond - AI4EIC 2023 Annual Workshop · November 2023 Event/Organization Administration Catholic University of America, Washington, DC

The 2023 annual workshop on AI4EIC --- Artificial Intelligence for the Electron Ion Collider, will be hosted by Catholic University of America in Washington, D.C., and will take place from November 28 to December 1, 2023.

Chair of the Organizing Committee - 25th International Symposium on Spin Physics · September 2023 Event/Organization Administration Dept. of Physics, Duke University, Durham Convention Center, Durham, NC

The 25th iteration of the International Spin Symposium (SPIN 2023) will be held September 24-29 at Duke University. The Symposium is one of the pre-eminent venues bringing together theorists and experimentalists in the field of spin physics. It is held every two years, alternating between the U.S., Europe and Asia.

The conference series has been held jointly since 2000, combining the High Energy Spin Symposia and the Nuclear Polarization Conferences.
The most recent symposia were held in Charlotteville, VA (2008), Jülich, Germany (2010) Dubna, Russia (2012), Beijing, China (2014), Urbana Champaign, IL (2016), Ferrara, Italy (2018) and Matsue, Japan (2021).
The organizing committee of SPIN2023 is co-chaired by Thomas Mehen and Anselm Vossen. They can be contacted using spin2023_contact@duke.edu

Chair of the Organizing Committee - Belle II Summer Workshop · July 2023 Event/Organization Administration Duke University, Duke University, Durham, NC

The purpose of this workshop is to help students, postdocs, and more senior researchers get started and make progress on Belle II analyses and performance studies, either studying a physics channel or studying detector performance. It will cover physics topics, computing, and Belle II software in a hands-on tutorial format.

This workshop is open to all Belle II collaborators and we welcome attendance from across the collaboration.

Co-Organizer - 1st International Workshop on a 2nd De- tector for the EIC · May 2023 Event/Organization Administration Temple University, Temple University, Philadelphia, PA

The EIC Users Group is organizing the 1st International Workshop on a 2nd Detector for the Electron-Ion Collider. The workshop will be held from May 17-19, 2023, at Temple University in the Science Education and Research Center.

Scientific topics discussed at the workshop include:

Scientific Opportunities with a 2nd Detector

Detector Technologies

R&D Needs & Perspectives

Opportunities for AI/ML

International Perspectives and Community Broadening

The EICUG community's strong preference for two detectors has led to multiple exciting detector initiatives. We invite all interested groups to participate. While we strongly encourage in-person participation, remote connections will be provided. Please register using the "Registration" link by May 12, 2023!

This event will be organized jointly by the EIC User Group, CFNS, and Temple University.

Co-Organizer - EICUG 2nd Detector Incubator Meeting · December 2022 Event/Organization Administration Stony Brook University, Stony Brook, NY

nder the coordination of the Electron-Ion Collider User Group (EICUG), the first meeting on the 2nd Detector at Interaction Region 8 (IR8) will take place Dec 6-8, 2022.

The meeting will be centered on two aspects of complementarity with Detector 1 (EPIC):

Cross checks of key measurements (and potential discoveries).

New opportunities enabled by unique features of a 2nd detector such as the 2nd focus in IR8.

A goal of this "incubator" meeting is to foster open discussions and exchanges in preparation for other upcoming activities, including a larger, in-person "kick-off" meeting in the spring of 2023.

Theorists and computational scientists participation is particularly welcome at this stage as we are looking to enhance theory/computation/experiment intersections and synergetic collaborations.

The meeting will be hosted by the Center for Frontiers in Nuclear Science (CFNS) at Stony Brook University. It will be run in a hybrid mode with remote access on Zoom that will be made available on the indico page

While we have selected a few discussion-leading talks, all members of the community are invited to participate in the meeting and to submit abstracts for 5 minutes flash talks. A program draft is available on indico where your abstracts can also be submitted.

Co-Convener track Reconstruction and Particle Identification - 2nd Workshop on Artificial Intelligence for the Electron Ion Collider · October 2022 Event/Organization Administration William and Mary, Williamsburg, VA

This event follows the productive experience of the first AI4EIC workshop held in 2021 at CFNS and is organized by the EICUG AI WG. The scope of this second workshop is to cover all active and potential areas of applications of AI/ML for the EIC.

The workshop will include sessions on (i) accelerator and detector design (EPIC and potentially detector-2), (ii) connections to theory, (iii) analysis, (iv) reconstruction and particle identification, (v) infrastructure and frontiers in AI/ML and (vi) streaming readout, which will allow discussing different problems, perspectives and leading-edge solutions.

During the workshop we will have AI/ML tutorial sessions provided by experts (academia, national labs, industry). The workshop will also host a Hackathon event (on October 14, whole day event), and a cash prize will be given to the solution winning the competition.

During the first day, we will have talks with perspectives on AI/ML-related research from funding agencies.

AI/ML will be an essential part of all phases of the future EIC and is already contributing to its realization starting from the design and R&D phases. This workshop is a great opportunity to update the community on the progress of ongoing projects and future plans, with discussions on multiple cross-cutting topics that bring together theorists, experimentalists, and AI/ML practitioners.

Chair of the organizing committee - Correlations in Partonic and Hadronic Interactions (CPHI) 2022 · March 2022 Event/Organization Administration Duke University, Durham, NC
Co-Organizer - Precision Studies on QCD at EIC · July 2021 Event/Organization Administration Asia Pacific Center for Theoretical Physics, Korea, online
Elected Member of the CLAS Speakers Committee · September 2020 Committee Service
Co-Convener for the Semi-inclusive Reactions Physics Working Group of the Electron-Ion Collider Yellow Report · January 2020 Other
Co-organizer - session "Quark-Gluon Correlations" at the 8th Workshop of the APS Topical Group on Hadronic Physics · April 2019 Event/Organization Administration APS, Denver, Co
Chair of the Organizing Committee - Workshop on Novel Probes of the Nucleon Structure in SIDIS, e+e- and pp" (FF2019) · March 2019 Event/Organization Administration Duke University, Durham, NC
Co-organizer - Workshops "Hadron Structure I+II", 5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan · October 2018 Event/Organization Administration APS/JPS, Waikoloa, HI

Academic & Administrative Activities


2022 - present, Member of the EICUG 2nd detector working group
2022 - 2023, Co-convenor of the ePIC working group, Athena Collaboration
2021 - 2022, Co-convenor of the SIDIS working group, Athena Collaboration
2021 - present, Member of the CLAS service work committee
2021 - present, Member of the organizing committee for the IR2@EIC initiative