• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT

    User name xiaohui

    Log entry time 17:42:45 on May18,2008

    Entry number 238660

    Followups:

    keyword=Elastic vs background with BB

    Just did some rough estimation with a coint. trigger only run 1297, and a single run (T3) 1296.
    -----------------------

    I compared the counts with no cut and tight elastic cuts(graphic cut in ph-dp + Zcut on target(-0.025 The background to elastic ratio:
    with BB: 2.7
    without BB: 1.2

    This could be enhanced if:
    turn on some shower blocks.

    with BB the last two columns off(larger angle): 2.8
    with BB the bottom 8 rows off :2.7
    with BB both last two columns and bottom 8 rows off: 2.8
    with BB only cut on 9X5 blocks around the elastic spot: 2.9

    By this rough estimation, it seems that there is no obvious enhance when we turn off the other shower blocks.

    Will check again with Guy's calculation which predict the ratio to be around 4 if we turned off the other blocks.