Final state study Jaewon Park University of Rochester MINERvA/Jupiter Group Meeting, Feb 21, 2007.

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Presentation transcript:

final state study Jaewon Park University of Rochester MINERvA/Jupiter Group Meeting, Feb 21, 2007

2 Energy calibration ID+ECAL+HCAL  Single pi0 (theta=0) beam  E(pi0)=100MeV to 1GeV Energy response is nonlinear function of bea m energy especially in low energy region If minimum gamma energy is required, calibr ation got better but loose efficiency Nonlinear calibration is tried, but it’s not good idea. Infinite ID

3 mass Pi0 mass is determined from two gamma energ y and angle between the m To find out contribution of each error, try with tr ue value  Reco edep + true dir  True edep + reco dir Error of angle gets large r as E increases. Pi0 mass shift is due to nonlinear energy respon se at low energy region.

4 2mm lead ECAL is used In nonlinear calibration I used instead of mass in infinite ID It’s very similar to True edep + reco dir in ID+ECAL+HCAL Remarks

5 mass in infinite ID 2mm lead ECAL is used In nonlinear calibration I used inst ead of