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    User name riordan

    Log entry time 07:47:02 on November 01, 2008

    Entry number 245866

    Followups:

    keyword=BigBite Momentum Reconstruction

    I looked quickly at the BigBite momentum reconstruction. It looks to be about 25 MeV from where it should be. Also the momentum resolution is larger than what we've seen with the GEn analysis. It should improve significantly once the drift chamber is properly calibrated.

    The momentum to calibrate to is given by the formula for elastic scattering and is dependent only on the scattering angle (given as BB.tr.pz/BB.tr.p = cos(theta_e))

    p_elastic = (1.231*0.938)/(0.938+1.231*(1-BB.tr.pz/BB.tr.p))




    Figure 1