QCD Matter under Extreme Conditions

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A part of the INT Program 10-03 "Gluons and the quark sea at high energy, INT, Seattle, Sep.13-Nov.19, 2010

Coordinators: A.Accardi, M.Lamont, C.Marquet

Purpose of the INT program

The purpose of the INT 10-3 program Gluons and the quark sea at high energy: distribution, polarization, tomography is rather concrete -- it is to sharpen the science case for a future Electron-Ion Collider (EIC). The EIC is envisioned primarely as a high-energy and high-luminisity QCD machine which will address open questions about the dynamics of quarks and gluons: unpolarized and polarized distributions, tomography, propagation in nuclear matter, fragmentation, various aspects of non-perturbative dynamics of partons, non-linear parton dynamics, etc.

The discussion at the program is supposed to be sufficiently concrete: one expects to see predictions and simulations corresponding the currently discussed parameters of the EIC. As a guide, the organizers sent all the participants the basic parameters in terms of EIC luminosity vs. energy.

Naturally, the discussion of such a large project is complex and non-linear: on one hand, the physics case will drive the machine parameters and requirements for the detector; on the other hand, the experimental equipment will determine with which accuracy one will be able to extract the desired physics from the data.

At the outcome of the workshop, a document akin to a CERN Yellow Report will be put together taking contributions from all participants. This will then be used as input for a white paper which will be written in the near future. With the white paper, one will then present the EIC physics case to the next NSAC (National Science Advisory Committee) meeting some time early in 2013. To summarize the EIC science case, we will also fill the EIC science matrix

QCD Matter under Extreme conditions

This part of the INT 10-3 program will take place weeks 3-5, from Sep 27 to Oct 15. In these three weeks, we will concentrate on

  • Investigating strong color fields in nuclei
  • Searching for the color glass condensate

More in detail, we will discuss

  • small x parton dynamics, saturation, diffraction
  • nuclear effects
  • fragmentation/hadronization in vacuum and in medium
  • connections to p+A and A+A physics
  • detector requirements

Participants and Talks

All talks in Room C421, Physics and Astronomy Tower

Week 3

Monday 27th September:

10:00: Tuomas Lappi - Theory overview of low-x in e+p and e+A collisions

11:00: Thomas Ullrich - Experimental overview of low-x

14:00: Cyrille Marquet - Outline of the week and general discussion

Tuesday 28th September:

09:40: Francois Gelis - Constraining the CGC in e+A to predict A+A

10:40: Guillaume Beuf - Analytical properties of the NLO-BK equation

13:30: Discussion - Alternatives to CGC in high-energy QCD

Wednesday 29th September:

09:40: Joachim Bartels - Twist expansion of the nucleon structure functions

10:40: Ruben Sandapen - The dipole picture in diffractive DIS

13:30: Discussion - Dipole models vs numerical solutions of NLO equations

Thursday 30th September:

09:40: Henri Kowalski - SATRAP in e+A collisions

10:40: Tobias Toll - Implementing the colour dipole model in a MC generator

Friday 1st October:

09:40: Hans-Juergen Pirner - jet evolution in hot and cold medium

10:40: Discussion (Cyrille marquet)- Write-up of results - further work planning

Week 4

Monday 4th October:

10:00: Will Horowitz - The EIC, heavy quarks and QGP phenomenology

11:00: Raphael Dupre - In-medium hadronization

14:00: Matt Lamont - Outline of the week and general discussion

Tuesday 5th October:

09:00: Boris Kopeliovich - Coherence in e+A collisions

10:00: Cyrille Marquet - Open diffraction

13:30: Discussion - Alternatives to CGC in high-energy QCD

Wednesday 6th October:

09:00: Bowen Xiao - Di-jet production and kT factorization

10:00: Ian Cloet - Nuclear effects throughout the (x,Q2) plane

13:30: Discussion - LHeC plans and perspectives (led by Brian Cole)

Thursday 7th October:

09:00: Giovanni Chirilli - DIS in high-energy limit at NLO

10:00: Alberto Accardi - Detecting saturation at the EIC with inclusive observables

13:30: Discussion - "EIC Detector (led by Elke Aschenauer)

15:30: Discussion - "F2 and FL how strong are nonlinear effects?" (led by Markus Diehl, on behalf of Tuomas Lappi)

Friday 8th October:

09:00: Kai Gallmeister - Nuclear hadronization within the GiBUU simulation code

10:00: Brian Cole - "Experimental jet physics at RHIC/LHC, the EIC and LHeC"

13:30: Discussion (Matt Lamont) - Write-up of results - further work planning

Week 5

Monday 11th October:

10:00: Mark Strikman - Colour coherent phenomena at collider energies

11:00: Pawel Nadel-Turonski - The MEIC detector at JLab - a detector cookbook for theorists

14:00: Alberto Accardi - Outline of the week and general discussion

15:00: Vadim Guzey - Leading-twist vs. dipole model nuclear shadowing in FL

Tuesday 12th October:

09:00: Abhijit Majumder - Using hard quark jets to study soft glue in large nuclei

10:00: Jerry Gilfoyle - Bose-Einstein correlations

13:00: Discussion - e+A radiative corrections (led by Elke Aschenauer)

Wednesday 13th October:

09:00:Vadim Guzey - Nuclear GPDs

10:00: Jian Zhou - TMDs in nuclei

13:30: Discussion - Golden candidates: nuclear gluons (led by Alberto Accardi)

Thursday 14th September:

09:00: Boris Kopeliovich - Heavy quarks and quarkonia in a nuclear environment

10:00: Andreas Schaefer - A personal perspective on EIC physics

13:30: Discussion - Write-up and golden candidates (jets and hadronization) (led by Alberto Accardi)

Minutes of the weeks

  • The notes and summary from week 3 can be found here
  • The notes and summary from week 4 can be found here
  • The notes and summary from week 5 can be found here

Kinematics grids for model comparisons

We would like to compare different theoretical models for physics at small-x (saturation, CGC) and larger x (LT shadowing, antishadowing, EMC effect) on a set of common kinematics for studies of

  • inlcusive structure functions (both small- and large-x)
  • diffractive structure functions (only small-x for the moment)
  • exclusive production (only small-x for the moment)

All interested participants are encouraged send their computations to Alberto, Cyrille and Matt, who will take care of making comparison plots with help from Markus and Elke.


  • November 5th, to be included in the summary talks on week 10
  • December 20th, to be included in the write-up

Golden experiment candidates

The discussion started in Seattle on golden experiment candidates will continue on this dedicated wiki page.


The presentations and discussions during these weeks will be collected in a dedicated part of the workshop write-up discussed above. This is not intended to be a plain proceedings, but to present in a coherent way the physics we think is interesting to pursue with nuclei at the EIC. The detailed structure of our write up will be discussed among all the participants during weeks 3-5. Individual contributions will be then collected and edited by the coordinators, and participants are welcome to post their contribution to the arXive.

A LaTeX template and class files for individual contributions can be downloaded here, and short instructions can be found here. A nice example of what we have in mind for our write-up is the CERN Yellow report on p+A physics at the LHC [1]

Please check the outline of our chapter, where your name may appear next to the agreed or suggested contribution. If you would like to contribute but don't see your name, please add it and contact the coordinators. Your contribution can be fairly short, but not obligatorily so, and if you contribute to more than one section you are welcome to write all of them in a single file. Your comments and suggestions are welcome.

Deadline for contributions: 20 Dec 2010

Other program topics


  • e+A working groups: