• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT

    User name Sergey

    Log entry time 23:28:59 on March 16, 2006

    Entry number 166966

    keyword=side evnts in BB trigger

    We see that there are a lot of side events in BB trigger. It could be
    seen in the plots of Y-coordinate in shower, when one module in PS has
    signal.
    So for PS modules which corresponding to positive Y, we should not have
    events in negative Y, and for PS modules which corresponds to negative Y,
    we should not see events on positive Y. Here are the figures shows
    Y-distribution when we have signal in different PS module.


    PS modules with numbers <= 26 corresponds to positive Y.
    PS modules with numbers > 26 corresponds to negative Y.

    So there are significant number of events which has Y-values not
    corresponding to PS module position. That means that we have events comes
    from the side of BB, it could explain, that we often has trigger from
    calorimeter, but do not has tracks in DC.

    A copy of this log entry has been emailed to: bogdanw@jlab.org,craver@jlab.org,feuerbac@jlab.org,nerses@jlab.org,riordan@jlab.org



    Y-distribution when PS7 has signal

    ps7.ps

    Y-distribution when PS14 has signal

    ps14.ps

    Y-distribution when PS20 has signal

    ps20.ps

    Y-distribution when PS34 has signal

    ps34.ps

    Y-distribution when PS41 has signal

    ps41.ps

    Y-distribution when PS47 has signal

    ps47.ps