EA propagation: meeting minutes 4/29/10

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J.Gilfoyle, M. Lamont, T.Mineeva, A.Accardi

Next Meeting: Thu, May 6, at 1pm

Update on HBT

Jerry discussed some further studies of HBT correlations with Pythia, which he will soon post on our wiki, see the HBT page. For the moment they can be accessed here.

Figure 5 and 7 show high statistics Pythia runs at EIC energy. The correlation is almost nothing at low energy (3+60), but becomes visible at high energy (11+60).

Figure 6 shows a high statistics tun at ZEUS energy, which confirms a correlation of teh order of what is seen experimentally.

The mistery is then why Hayk Hakobian sees a (very) large correlation at CLAS energy. A few comments during our discussion:

  • ZEUS claims the correlation to be Q^2 independent: can this be an issue at lower energy where Q^2 decreases in average?
    • Jerry will try a plot of the correlation vs. Q_12 and Q^2
  • Maybe in Hayk's plot the correlation comes from other sources, not the formation region in space-time: Jerry will ask Hayk / Will if they
    • took out the resonance contributions
    • consider Coulomb corrections
  • Are there model predictions for the sqrt(s) dependence of the correlations?
    • We need to check better the literature

Strategy for HBT

We need to convince ourselves that tehre will be a sizable signal at EIC. Pythia now indicates a small signal, but we need to check better if there are any generator issues, and understand the magnitude of teh signal at CLAS.

If we are confident for a good signal, we will go on and perform serious simualation and projection plots for EIC.

Jet page and other stubs

A jet physics page has been created by Raphael. There also are a few references for beginners. Stubs for our other main topics (light/heavy flavors, HBT) have also been created. Just clock on the topic names in our observable pages.