EA Parton propagation and fragmentation

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Our goal is to develop a program to explore parton propagation and fragmentation in a cold nucleus at the EIC. We should aim at

  • A list of possible measurements
  • Discussing new ideas and observables
  • Perform simulations, and projections for EIC measurements

For each of our favorite observables, we should try and compare the performance of the JLab and BNL designs, in order to contribute in building the science case leading to the choice of the best one.

Our initial results will be presented at the Argonne and INT meetings and correspondingly summarized in 2 white papers, see 'Timeline' below.

In practice

In practice, and to kick-start our work, I suggest the following 3 steps

  • Decide on a list of priorities
    • Make a short list of priorities (each of us)
    • Alberto will then collect them in a short document
  • Take responsibility
    • Stick names to the priorities
  • Work!
    • Aim for preliminary results at Argonne, final in Seattle
    • When a result is ready, provide a short write-up with plots and results for general discussion

We will soon set up weekly phone meetings.


Machine designs

Our focus should be on the medium-energy EIC (MEIC@JLab or MeRHIC), but it would be useful to evaluate how this program could be extended to a full-energy EIC, and wether the full-energy machine is necessary for our physics program, or this can be completed with the medium-energy machine.

I note here the main machine designs currently under consideration for quick reference and to standardize our studies

EIC-I (Medium-energy EIC)

  • [JLab] Failed to parse (unknown error): E=3+30 \ L=40\times 10^{33}
  • [JLab] Failed to parse (unknown error): E=11+30 \ L=0.4\times 10^{33}
  • [BNL] Failed to parse (unknown error): E=4+100 \ L=0.1\times 10^{33}

EIC-II (Full-energy EIC)

  • [JLab] Failed to parse (unknown error): E=11+120 \ L=10\times 10^{33}
  • [BNL] Failed to parse (unknown error): E=20+130 \ L=2.8 \times 10^{33}

However, feel free to explore non-standard scenarios that can optimize the physics output. Examples are

  • MEIC optimized in luminosity for 5-7 GeV electrons, with a resulting higher luminosity for the 11 GeV beam
  • A possible doubling of electron energy to, say, 22 GeV with luminosity reduced by apprixmately a factor 10
  • A full-energy EIC @ JLab, with E=22+120
  • A super high-energy eRHIC with E=30+320

More details can be found here.

A question we may want to keep in mind is: will our physics program likely be completed at the EIC-I, or wil it need also the full-energy EIC-II?



We want to complete our initial studies by the end of 2010 according to the timeline below, and to present our results first at the Argonne's "Nuclear Chromodynamics" workshop and then at the INT, Seattle, "The Science case for the EIC" workshop. Correspondingly we will contribute to 2 white papers. At the end of this first phase, we will evaluate how to continue.


  • June 7-9: JLab Users' meeting [report on Argonne's meeting]
  • Summer: JLab Users' white paper
  • Winter: INT white paper on The Science Case for the EIC

Resources & links


The list of members can be found here.