Next-generation GPD studies with exclusive meson production at EIC

4 Jun 2018, 08:00 → 6 Jun 2018, 23:00 US/Eastern

C-120 (CFNS Stony Brook)

Christian Weiss (Jefferson Lab), Lech Szymanowski, Marie Boer, Salvatore Fazio (Brookhaven National Laboratory)

Generalized parton distributions (GPDs) describe the 3-dimensional structure of the nucleon in QCD and provide new information about the internal dynamics of quarks and gluons (energy-momentum tensor, angular momentum). Measurements of GPDs with hard exclusive processes and related probes are an essential element of the EIC science program. While GPD measurements with deeply-virtual Compton scattering (DVCS) have been extensively discussed, the potential of hard exclusive meson production for GPD studies at EIC has not been fully explored so far. Meson production processes can directly probe gluons and quark spin structure in the nucleon, separate quark flavor distributions and strangeness, and reveal the dynamics in diffraction, color transparency, and saturation at small x. Recent theoretical advances and experimental results from HERA, COMPASS, JLab, and LHC, and the proposed program at RHIC, have heightened the interest in meson production and shown the promise and challenges of such measurements. The workshop will assess the potential of exclusive meson production for GPD studies with EIC and discuss the steps toward its realization. Topics include:

• Gluon imaging with heavy vector mesons (φ, J/ψ, Υ)
• Nucleon spin structure with pseudoscalar mesons (π, Κ, η)
• QCD factorization and nonperturbative dynamics in meson production
• Joint DVCS-meson analysis and GPD flavor separation
• Diffraction and quantum fluctuations in vector meson production
• Color transparency and saturation in meson production at small x
• Meson and baryon resonances in hard processes
• Central and forward detection in meson production at EIC
• Simulation tools for meson production

The meeting will bring together experimental and theoretical researchers for informal presentations and in-depth discussions. A particular goal will be to enable future collaborative work on process simulations and physics impact studies.

Monday, 4 June

08:50 → 09:30 INTRODUCTION/PLAN

08:50 Greetings from the CFNS

Speaker: Abhay Deshpande

09:00 Introduction from the organizers and plan of the meeting

Speaker: Christian Weiss (Jefferson Lab)

stonybrook18_intro.pdf

09:30 → 10:50 MESON PRODUCTION THEORY / PSEUDOSCALAR MESON PRODUCTION

Convener: Salvatore Fazio (Brookhaven National Laboratory)

09:30 Meson production in the modified hard scattering approach

Speaker: Peter Kroll (University of Wuppertal )

meson-production18.pdf

10:10 Pseudoscalar meson production and quark transversity

Speaker: Simonetta Liuti (U. of Virginia)

sl_BNL.pdf

10:50 → 11:20 Coffee break

11:20 → 12:20 MESON PRODUCTION THEORY / PSEUDOSCALAR MESON PRODUCTION

Convener: Christian Weiss (Jefferson Lab)

11:20 Transverse force tomography

Speaker: Matthias Burkardt (New Mexico State University )

Burkardt_SUNY18.pdf

12:00 Transversity GPDs in the large-Nc limit

Speaker: Kemal Tezgin (University of Connecticut )

TransversityGPDs.pdf

12:20 → 13:40 Lunch Break

13:40 → 14:10 MESON PRODUCTION THEORY / PSEUDOSCALAR MESON PRODUCTION

Convener: Marie Boer (CUA)

13:40 pi/eta production at JLab with 6 and 12 GeV

Speaker: Julie Roche (Ohio University)

DVMP_EIC_Roche.pdf

DVMP_EIC_Roche.pptx

14:10 → 15:00 MESON PRODUCTION THEORY / PSEUDOSCALAR MESON PRODUCTION: Discussion

15:00 → 15:30 Coffee break

15:30 → 17:10 ENERGY-MOMENTUM TENSOR, ANGULAR MOMENTUM, SCALAR STRUCTURE

Convener: Christian Weiss (Jefferson Lab)

15:30 Physics of energy-momentum tensor form factors

Speaker: Peter Schweitzer (UConn)

Talk-Schweitzer-8-Stony-Brook.pdf

16:10 Nucleon scalar structure and QCD vacuum

Speaker: Ismail Zahed (Stony Brook University)

eIC.pptx

16:50 GPDs and angular momentum

Speaker: Abha Rajan (University of Virginia)

AR_NY.pdf

17:10 → 18:30 ENERGY-MOMENTUM TENSOR, ANGULAR MOMENTUM, SCALAR STRUCTURE: Discussion

18:30 → 20:30 Reception

Social dinner/reception with catered food from Fratelli's Italian eatery in Stony Brook

Tuesday, 5 June

09:00 → 10:20 VECTOR MESON PRODUCTION IN ULTRAPERIPHERAL A-A/P-A

Convener: Marie Boer (CUA)

09:00 J/psi production in UPCs at ALICE

Speaker: Christopher Anson (Creighton University)

GPDtalk_CAnson_ver5.pdf

09:40 Vector meson production on nuclei and nuclear shadowing

Speaker: Vadim Guzey ( University of Jyvaskyla (Finland), Petersburg Nuclear Physics Institute (Russia) )

guzey_sb_2018.pdf

10:20 → 10:50 Coffee break

10:50 → 12:10 VECTOR MESON PRODUCTION IN ULTRAPERIPHERAL A-A/P-A

Convener: Salvatore Fazio (Brookhaven National Laboratory)

10:50 Vector meson production in UPCs and eSTARlight simulator

Speaker: Spencer Klein (LBNL)

StonyBrookEIC.pdf

11:30 GPDs sensitive measurements at RHIC and the EIC

Speaker: Elke Caroline Aschenauer (Brookhaven National Laboratory)

eca.EIC.UPC.pptx

12:10 → 13:30 Lunch Break

13:30 → 14:10 Perspective: QCD in exclusive processes

Speaker: George Sterman (Stony Brook University)

14:10 → 15:30 VECTOR MESON PRODUCTION IN E-P/MU-P

Convener: Salvatore Fazio (Brookhaven National Laboratory)

14:10 Exclusive vector mesons at HERA and HERMES

Speaker: Charlotte Van Hulse ( University of the Basque Country – UPV/EHU )

excl_vm_18.pdf

14:50 DVMP in muon scattering at COMPASS

Speaker: Andrzej Sandacz ( National Centre for Nuclear Research, Warsaw )

sandacz-stonybrook18(2).pdf

15:30 → 16:00 Coffee break

16:00 → 17:00 VECTOR MESON PRODUCTION IN E-P/MU-P

Convener: Christian Weiss (Jefferson Lab)

16:00 Some thoughts about the theory of meson production

Speaker: Markus Diehl (DESY)

diehl-stony(1).pdf

16:30 GPD analysis at CLAS12

Speaker: Kyungseon Joo (National Science Foundation)

17:00 → 18:30 Discussion: Vector meson production status and perspectives at EIC

18:30 → 20:30 Dinner (optional, self-paid)

Wednesday, 6 June

09:00 → 10:00 EIC DETECTOR AND SIMULATIONS

Convener: Salvatore Fazio (Brookhaven National Laboratory)

09:00 General requirements for exclusive VMP and the EIC/JLEIC detector

Speaker: Yulia Furletova (Jefferson Lab)

JLEIC_VM_GPD_2018.pdf

09:30 Simulation tools and an EIC/eRHIC dedicated detector

Speaker: Alexander Kiselev (Brookhaven National Laboratory)

ayk-2018-06-06-stony-brook-gpd-workshop.pdf

ayk-2018-06-06-stony-brook-gpd-workshop.pptx

09:45 The EIC-sPHENIX Project

Speaker: Nils Feege (Stony Brook University)

nfeege_CFNS_GPD_2018_06_01_EICsPHENIX.pdf

10:00 → 10:30 EIC DETECTOR AND SIMULATIONS: Discussion

10:30 → 11:00 Coffee break

11:00 → 12:45 J/PSI PRODUCTION NEAR THRESHOLD / BACKWARD MESON PRODUCTION

Convener: Marie Boer (CUA)

11:00 J/psi near threshold with JLab12

Speaker: Rafayel Paremusyan (University Of New Hampshire)

Workshop_StonyBrook_2018.pdf

11:30 J/psi and Upsilon production at JLab12 and EIC

Speaker: Sylvester Joosten (Temple University)

20180606-GPD-SBU-Quarkonium-JLab-EIC.pdf

12:00 Backward meson production

Speaker: Wenliang Li (College of William and Mary)

Wenliang_Li_GPD_Workshop_at_Stony_Brook.pdf

12:30 Exclusive two-pion production in sigma channel

Speaker: Dilini Bulumulla (Old Dominon U.)

pipi_production_Dilini.pdf

12:45 → 14:00 Lunch Break

14:00 → 15:00 GPDs IN COMPTON-LIKE PROCESSES

Convener: Christian Weiss (Jefferson Lab)

14:00 Timelike Compton scattering and related processes

Speaker: Jakub Wagner (National Centre for Nuclear Research)

Wagner_StonyBrook2018.pdf

14:40 Accessing GPDs through exclusive photo- and electro-production of lepton pairs

Speaker: Marie Boer (CUA)

mboer_dileptons.pdf

15:00 → 15:40 GPDs IN COMPTON-LIKE PROCESSES: Discussion on compton-like processes vs. DVCS

15:40 → 16:10 Coffee break

16:10 → 17:30 Discussion: Meson production simulations for EIC - Plans, Tools, Collaboration

Conveners: Salvatore Fazio (Brookhaven National Laboratory), Marie Boer (CUA), Christian Weiss (Jefferson Lab)

17:30 → 17:40 Adjourn