Re: Problems with pp acceptance - possible brag problem?

From: Bjorn H Samset (bjornhs@rcf2.rhic.bnl.gov)
Date: Wed May 21 2003 - 12:23:34 EDT

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    On Tue, 20 May 2003, Flemming Videbaek wrote:
    
    > Were the tpm1-d5-tpm2 moved 50 cm back as in the pp data; this it was
    > for sure in pp since the
    > 35 deg can only be reached in that config.
    
    And indeed, that was the problem :-) I had only pushed back TPM2, not the
    entire array. After a day of fighting with geant (and hectic mailing with
    Flemming) the problem seems to be solved.
    
    The new acc files can be seen here:
    http://www.fys.uio.no/~bjornhs/brahms/ppAccProblem/
    (bottom of the page)
    It now looks just like you'd expect - the data follow the acc. very nicely
    except for a few points that are just outside, wich is to be expected from
    the uncertainty in the vertex determination.
    
    Thanks again to Flemming and Kris :-)
    
    --
    Bjorn H. Samset                           Phone: 22856465/92051998
    PhD student, heavy ion physics            Adr:   Schouterrassen 6
    Inst. of Physics, University of Oslo             0573 Oslo
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