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    User name Seonho Choi

    Log entry time 11:42:44 on July 1,2001

    Entry number 65273

    This entry is a followup to: 65192

    keyword=Difference in number of events in both helicities

    As regard to the difference in the number of events in both helicities, I checked two runs with different beam half-wave plate setting.












































    Beam half-wave
    Run Number
    No. Evt (h=-1)
    No. Evt (h=+1)
    Hel. Pulse (h=-1)
    Hel. Pulse (h=+1)

    IN
    1670
    16485
    15754
    40907
    40909

    OUT
    1687
    16278
    16970
    43793

    		 43796


    As we can see here, the number of pulses in each helicity is basically
    the same. They differ by 2 to 3 out of 40000. But number of events recorded
    in the tape DO show difference between the two helicities. This disrepancy
    is from the physics. Especially, pion asymmetry is pretty big (a few percent)
    and pions can easily generate this difference between the number of events
    of both helicities. And when we put in the beam half-wave plate, they change
    sign, as they should be. So there is nothing to worry about the difference
    you see between the two helicities from the physics kumac.