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    User name jpchen

    Entry time Thu Jul 29 16:20:18 EDT 1999

    Entry number 67

    keyword=Minutes of 7/28 analysis meeting

    Minutes of 7/28 analysis meeting:
    Present: Alexandre Deur, Pibero Djawotho,Mark Jones and Jian-ping Chen.
    On the phone from Temple: Karl Slifer, Seonho Choi.

    1) Alexandre: - I have switch from my ntuple (got using Xiaodong units and the
    standart version of espace) to Seonho ntuples. Assymetries at 1.7 GeV are
    consistent when they are computed with both kind of ntuples.
    - We have a better understanding of the elastic assymetry. With
    inclusion of the second 1.72 GeV pass elastic runs (40 % of the total 1.72
    elastic data), the two arms are now in agreement within the error bar. However
    the experimental value is still lower than the theoritical one. The remaining
    work to be done: Include detector efficiency, Have a better statistic for the
    acceptance effect, N2 dilution and radiative corrections.
    - I began to look at the 0.86 GeV elastic events.
    - I had a look at the PWIA code from Ole. The goal is to include
    it in the monte carlo.

    2) Pibero: Distributed copies of David Lhuillier's presentation on radiative
    corrections for elastic scattering. Are collecting references on radiative
    corrections. Was working on having some histograms to look at individial
    scintillator, but had problem to get them out. Mark Jones suggested that
    he may need to change ESPACE (not just kumac file) to have the histograms.
    Will start to analyse N2 and empty target runs for dilution factor.Have the kumac
    from Feng (who analyzed the N2 and empty target runs for E95-001).

    3) Seonho: Checking on beam position/raster analysis.
    Will submit about 1000 jobs for production on Friday afternoon,
    which would use a lot of the FARM CPU for a few days.

    Discussed the disk space and computing power issue: J. P. had a chat with
    Bob Michaels. With the addition of more CPUs and some adjustment of the
    distribution of computing power among the halls, FARM computing power
    should not be a major problem. If there are problems, send complaints to Bob.
    For work disk space: currently there are 200 GB as a shared disk (among all
    hall A experiments) and four 50 GB disks used for teh current experiment,
    the next experiment and the two recently completed experiments. With the
    completion of HAPPEX, E94-010 (GDH) will be out of the 4. I voiced concern
    and expressed that now is the most critical time since the production is
    underway. Also I mentioned that this experiment has most of data and
    much more difficult analysis than most experiments. Treat all the experiments
    same way may not be the best way to satisfy the exprimental needs.
    Bob will consider it. Also more disk will be added into the pool, which will
    ease the situation for disk space.