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The CFNS seminar takes place every first and third Thursday of the month at 4:00pm Eastern Time. It covers a wide range of theory and experimental topics connected to the science at the Electron Ion Collider, which is the current main focus of the Center. The seminar locations alternate between Brookhaven National Laboratory (BNL, CFNS Seminar Room 2-38, Bldg. 510) and Stony Brook University (Peter Paul Seminar Room C-120, Physics Building). Coffee and cookies will be served before the seminar, at 3:45pm in the adjacent room.

If you would like to speak at one of the upcoming seminars or suggest a speaker, please contact the seminar organizers via cfns_seminars@stonybrook.edu and include a title, brief abstract, and possible dates.

 

Date

Upcoming Seminars

Date

October 16, 2025

3:30PM

Upcoming Seminars

CFNS Seminar: pion/kaon PDFs
Speaker:
Wen-Chen Chang (Institute of Physics, Academia Sinica, Taiwan)
Location: Stonybrook University - Room C-120 zoom
Abstract:
The pion, as the Goldstone boson of dynamical chiral symmetry breaking of the strong interaction, is the lightest QCD bound state. Because of its light mass, pion plays a dominant role in the long-range nucleon-nucleon interaction. Understanding the internal structure is important to investigate the low-energy, non-perturbative aspects of QCD. Nevertheless, the uncertainties of parton density functions (PDFs) of pions are relatively huge, because of the lack of rest pion targets.

Date

October 15, 2025

3:30PM

Upcoming Seminars

CFNS Seminar: 3D Imaging of the Pion on a Fine Lattice
Speaker:
Jinchen He, BNL
Location: Stonybrook University - Room C-120zoom
Abstract:
We present the first lattice QCD calculation of the pion valence-quark transverse-momentum-dependent parton distribution function (TMDPDF) within the large-momentum effective theory framework. Using Coulomb-gauge correlators on a fine lattice with momenta up to 3 GeV, we determine the quasi-TMD beam function, the intrinsic soft function, and the associated Collins–Soper kernel. Our results show consistency with perturbation theory at short distances and agree with recent lattice determinations at larger transverse separations. Combining these ingredients, we obtain the bT-dependent pion TMDPDF and also present results for the transverse-momentum-dependent wave function of a heavier pion. These findings provide new insight into hadron structure from first-principles QCD.

Date

Recent Seminars

Date

October 2, 2025

3:30PM

Recent Seminars

CFNS Seminar:Effect of TMD Shape function at low transverse momentum in $J/\psi$ photo- and electro-production.
Speaker:
Raj Kishore, University of the Basque Country, India
Location: Stonybrook University - Room C-120
Abstract:
A proper transverse momentum-dependent (TMD) factorization for quarkonium production at low transverse momentum necessitates the convolution of the TMD parton distribution function (TMDPDF) with an additional transverse momentum-dependent function, known as the TMD shape function (TMDShF). I will present a phenomenological study of the impact of the TMDShF on quarkonium production in electron-proton collisions, comparing our results with predictions from the standard non-relativistic QCD (NRQCD) framework. Our analysis demonstrates that the inclusion of the TMDShF provides a qualitative explanation for the photo- and electro-production data, particularly at low transverse momentum, where standard NRQCD predictions fail. Furthermore, we discuss the implications of a proper treatment of the TMDShF for the extraction of long-distance matrix elements (LDMEs) in the low-to-intermediate transverse momentum regime

Date

September 4, 2025

3:30PM

Recent Seminars

CFNS Seminar:Explore the nucleon tomography at the future electron-ion collider
Speaker:
Feng Yuan (LBL)
Location:
Stonybrook University - Room C-120 Slides
Abstract: 
Understanding the internal structure of the nucleon and nuclei is of fundamental importance in subatomic physics. A major focus of research on this topic is the partonic structure of the nucleon, including its spin and mass structure. In this talk, I will review recent advances and progress, and emphasize the opportunities at the planned electron-ion collider (EIC). In particular, the EIC will provide unprecedented precision in exploring many of the outstanding questions. The talk will focus on one particular aspect, the nucleon tomography: a three-dimensional imaging of partons in the nucleon.

Date

August 28, 2025

3:30PM

Recent Seminars

CFNS Seminar: Entanglement entropy, a probe to study hadronization
Speaker:
Jaydeep Datta (Stony Brook University)
Location:
Stonybrook University - Room C-120
Abstract:
Recently, it was discovered that the proton structure at high energies exhibits maximal entanglement. This leads to a simple relation between the proton’s parton distributions and the entropy of hadrons produced in high-energy inelastic interactions, that has been experimentally confirmed. In this Letter, we extend this approach to the production of jets. Here, the maximal entanglement predicts a relation between the jet fragmentation function and the entropy of hadrons produced in jet fragmentation. We test this relation using the ATLAS Collaboration data on jet production at the Large Hadron Collider, and find a good agreement between the prediction based on maximal entanglement within the jet and the data. This study represents the first use of quantum entanglement framework in experimental study of the hadronization process, offering a new perspective on the transition from perturbative to non-perturbative QCD. Our results open the door to a more comprehensive understanding of the quantum nature of hadronization.

Date

August 13, 2025

4:00 PM

Recent Seminars

CFNS Seminar: QCD, ‘tHooft Model and the Light-Front Quark Model
Speaker:
Chueng-Ryong Ji (North Carolina State University)
Location:
Stonybrook University - Room C-120

Abstract: 
Interpolating instant and light-front dynamics, I will present a mass gap solution of the 1+1D QCD in the large Nc limit known as the ‘tHooft model to discuss a link between QCD and the Light-Front Quark Model (LFQM). The interpolation between the instant form dynamics and the light-front dynamics will be
highlighted for the study of hadron structures and the utility of the Bakamjian-Thomas construction will be illustrated in the LFQM phenomenology.

Date

July 16, 2025

4:00PM

Recent Seminars

CFNS Seminar: Theory and Phenomenology of Generalized Parton Distributions
Speaker: Zhite Yu (Jefferson Lab)
Location: Stonybrook University - Room C-120

Abstract:Generalized Parton Distributions (GPDs) are fundamental field-theoretic correlation functions in QCD that encode tomographic images of partons inside hadrons. In this talk, I will provide a brief overview of the theory and phenomenology of GPDs, focusing primarily on the recently developed framework of single-diffractive hard exclusive processes for connecting GPDs to experimental observables. I will concentrate on the extraction of GPDs from experimental processes, with particular emphasis on the challenges and potential solutions related to disentangling different GPDs and determining their x-dependence, both of which are critically important for constructing tomographic images and matching the x-moments of GPDs to various emergent hadronic properties.

Date

June 12, 2025

4:00PM

Recent Seminars

CFNS Seminar: Quasinormal modes and hydrodynamics of nonthermal fixed points
Speaker: Michal P. Heller (Ghent University)
Location: Stonybrook University - Room C-133  Slides

Abstract: Nonthermal fixed points are paradigmatic weak coupling far from equilibrium phenomena associated with self-similarity in time. In the nuclear physics context, they play an important role in theoretical understanding of thermalization processes in QCD. I will discuss how adopting the lenses from strongly-coupled systems allows to better understand how nonthermal fixed point are created. Also, I will use this perspective to advocate for new physical processes in the vicinity of a nonthermal fixed points that can be probed in the existing cold atom experiments.

 


 

 

 

 

 

 

 

 

 

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