GDR QCD workshop on coherence/incoherence in hadronic & diffractive collisions at DIS and at hadron colliders

11 oct. 2023, 09:00 → 12 oct. 2023, 20:00 Europe/Paris

Auditorium Joliot Curie (IJCLab)

Laure MASSACRIER (Institut de Physique Nucléaire d'Orsay), Michael Winn (DPhN/IRFU/DRF/CEA Paris-Saclay)

This workshop treats coherence and incoherence in diffractive and hadronic collisions at different type of collisions and energy scales.

 

In particular, we would like to discuss recent experimental progress and theoretical considerations concerning:

• Coherent vector meson production in hadronic collisions
• The relation between coherence/incoherence and exclusive/dissociative in photon(*)-proton and photon(*)-nucleus interactions and what they can tell us about hadron structure
• The applicability of the good-walker formalism that relates coherence/incoherence with averages and fluctuations.

 

We profit in this context from the local expertise on:

• The experimental LHC programme on ultra-peripheral and peripheral collisions
• The experimental  JLAB programme with proton and nuclear targets
• The theoretical expertise on exclusive physics with perturbative QCD and related topics.

This activity is transversal to the LHC and JLAB programme and is closely related to future measurements at the LHC and at the EIC.

mer. 11 octobre

Registration

Introduction

Présidents de session: Laure MASSACRIER (Institut de Physique Nucléaire d'Orsay), Michael Winn (DPhN/IRFU/DRF/CEA Paris-Saclay)

1 Welcome

Orateurs: Laure MASSACRIER (Institut de Physique Nucléaire d'Orsay), Michael Winn (DPhN/IRFU/DRF/CEA Paris-Saclay)

Welcome.pdf

2 The impulse approximation

The impulse approximation as a basis
https://journals.aps.org/pr/pdf/10.1103/PhysRev.85.636

Orateur: Dr Cédric Mezrag (Irfu/DPhN)

Coherence_Introduction.pdf

Coherence in hadronic collisions

Goal of session:
- Summary of experimental results and current modeling
- Open conceptual questions to describe/classify the production

3 Recent experimental result from ALICE and prospects

Orateur: Mallick Dukhishyam (IJCLab)

GDR_QCD_IJCLab_ALICE.pdf

4 Recent experimental results from STAR and prospects

Orateur: Dr Daniel Kikoła (Warsaw University of Technology)

UPC-STAR-GDR-QCD-2023.pdf

5 Gamma Gamma to dilepton production at LHC and RHIC and prospects

Orateur: Raphaelle Bailhache

Bailhache.pdf

15:05 Coffee

6 Modeling of coherent production in hadronic collisions I

Orateur: Beatriz Gay-Ducati

France_final_version.pdf

7 Modeling of coherent production in hadronic collisions II

Orateur: Klusek

MKG_GDR_QCD_Mariola.pdf

8 Modeling of coherent production in hadronic collisions III

Orateur: Zha

9 Discussion round

What is known by now?
What is unknown and can be measured soon?

Open theoretical questions:
- conditions necessary for coherent: which scales?
- Scale separations: how to verify experimentally
- treatment of interference of different processes

Orateurs: Gay-Ducati, Klusek, Zha

discussion-session.pdf

jeu. 12 octobre

Coherence in diffractive events on proton and nuclei

Summary of experimental results
Relation between fluctuations and incoherence
Access to structure nuclear structure questions
Experimental feasibility

10 Recent experimental results in UPC collisions on coherent photoproduction at LHCb

TBC

Orateur: Ronan Mcnulty

coh_incoh_mcnulty.pdf

11 Recent experimental resuls in UPC collisions on incoherent and dissociative production with ALICE off the proton

Orateur: Michael Winn (DPhN/IRFU/DRF/CEA Paris-Saclay)

incoherence_2023.pdf

10:30 Coffee

12 Experimental opportunities with tagging at JLAB

Orateur: Raphaël DUPRE (IPN Orsay)

TaggedDIS.pdf

13 Future measurements for nuclear structure at EIC in exclusive reactions

Orateur: Rachel Montgomery (University of Glasgow)

Montgomery-EIC-ExclusiveNuclear 1.pdf

New experimental and theoretical ideas

• Summary of new ideas, discussion of feasibility and information content in view of hadron/nuclear structure
• Limits and improvements of formal theory, connection with observables

14 Opportunities with jets in photoproduction at the LHC

Orateur: Cristian Baldenegro Barrera (Laboratoire Leprince-Ringuet)

OrsayWorkshop-1.pdf

15 New experimental idea LHC: coherent production as reservoir for QGP studies?

Orateur: Ginez Martinez

GinesMARTINEZ_GDRQCDWorkshop_v2.pdf

16 Signatures of saturation involving dissocation

Orateur: Renaud Boussarie (CPHT, CNRS, Ecole polytechnique, IP Paris)

BoussarieGDRworkshop.pdf

17 New experimental ideas LHC: inclusive photoproduction

TBC

Orateur: kate lynch

KL_GDR_v1.pdf

17:20 coffee

18 Color transparency in deep virtual meson production

Orateur: Bernard Pire (CPHT-CNRS-Ecole polytechnique)

ColorTranspOctobre23.pdf

19 Discussion round: challenges and ideas about hadron/nuclear structure and QGP measurements with coherent/incoherent production at LHC and EIC

• relation between (in)elastic and (in)coherent

• Experimental correspondence of coherence/incoherence

• high-energy: Limits of Good-walker formalism

https://arxiv.org/abs/2301.01408

Orateurs: Cyrille Marquet (CPHT - Ecole Polytechnique), Samuel Wallon (LPT Orsay and UPMC university)

(in)coh-discussion.pdf