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Energy Calibration and Pi0 Mass Determination in Particle Physics Experiments

This study discusses energy calibration for beam particles, focusing on Pi0 mass determination using gamma energy. It analyzes the nonlinear energy response and its impact on mass calculations in particle experiments.

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Energy Calibration and Pi0 Mass Determination in Particle Physics Experiments

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

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

  3. mass • Pi0 mass is determined from two gamma energy and angle between them • To find out contribution of each error, try with true value • Reco edep + true dir • True edep + reco dir • Error of angle gets larger as E increases. • Pi0 mass shift is due to nonlinear energy response at low energy region.

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

  5. mass in infinite ID • 2mm lead ECAL is used • In nonlinear calibration I used instead of

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