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    User name mhuang/jixie/chao

    Log entry time 03:09:56 on March 13, 2012

    Entry number 366110

    keyword=Large negative VertexZ events

    We were looking at Gep optics data (#22220, C12 foil, no LHe), and found
    that they are probably from Aluminum.
    In Figure 1, the up-left pad dp plot, if the highest peak is C12, then
    the most right side peak should be Al, considering the momentum difference. 
    Then according to the plot, the large negative VertexZ events mostly come
    from the Al elastic peak. If including the central hole cut, Al peak cut,
    and negative vz cut all together, vz distribution shows two peaks, which
    look like two layers of Al.

    A copy of this log entry has been emailed to: jpchen, vasulk, lerose, doug, jixie, mhuang, cg2ja

    Figure 1