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    User name Hong Xiang

    Log entry time 18:34:26 on March 2,2001

    Entry number 57425

    This entry is a followup to: 57392

    keyword=More check on the pion PID/counts


    Run through 1.0M events from run_1969(sing9, ld2/in, E=2558.GeV)
    using the updated database(Wang, 3/01/01), and compare to the one
    before the update(geometry info for preshower/shower added), minor
    differences are noticed:

    1). pi- counts within the reconstructed E_gamma window(2433.-2533.
    MeV) went up by less than 1%. Can't see any difference in the
    rprshow vs. rshow scatter plot.

    2). pi+ counts with the E_gamma window(2433.-2533.MeV) remain the
    same. This makes sense since pi+ PID shouldn't be affected.

    Reconstructed E_gamma spectra for pi- and pi+ are attatched below.

    Hong


    FIGURE 1

    FIGURE 2