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    User name Kalyan

    Log entry time 02:59:56 on February 14, 2009

    Entry number 261054


    keyword=BB acceptance issues

    Here are some plots on the BB acceptance.

    1. Plot of BB acceptance in dispersive direction using track x+ track theta. This is for T2 triggers. The large bump around x=-0.9 is mostly due to pion like events( this is top of the acceptance)

    2. If one selects good electron by requiring large preshower signal, then the peak around x=-0.9 reduces significantly. So, for good electrons the acceptance looks reasonable with T2(plot2).

    3. Acceptance in shower x direction is shown(plot3). If one look at the events around x= -0.9, they all have low preshower energy deposition(red in plot4) and look more like pions.

    For good electrons I think the acceptance is reasonable, at least with T2. There were not many T6 triggers in the rootfiles that I was looking at. May be some one can do similar exercise to look at T6.

    A copy of this log entry has been emailed to: brads,posik,flay

    Figure 1

    Figure 2

    Figure 3

    Figure 4