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Study of Proton dE/dx and Comparison with Geant4 Truth Data

This study involves a detailed analysis of proton dE/dx using numerical calculations, Geant4 simulations, and data from NIST. It covers the comparison of mean and most probable values (MPV) of dE/dx, validation against NIST dataset, impact of charge and lifetime corrections, and the influence of tail removal on results. The study also explores issues related to energy calibration for muons and normalization problems in the analysis.

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Study of Proton dE/dx and Comparison with Geant4 Truth Data

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  1. Proton dEdx Study Wenqiang Gu 1

  2. Proton dEdx MPV & mean: numerical calculation Proton Geant4 truth MPV MPV Mean (NIST) https://github.com/BNLIF/wire-cell- mcs/blob/master/apps/wire-cell-dedx-resrange.cxx 2

  3. Proton dEdx MPV & mean: WCP prediction Proton Geant4 truth MPV Mean MPV Mean (NIST) • Mean dE/dx is validated by NIST dataset, unlikely to be wrong At low residual range/ high dEdx, use mean to replace MPV. Agrees well. • 3

  4. Geant4 comparison at full range Mean MPV Geant4 extracted “MPV” 4

  5. Mean dEdx from Geant4 and calculation Ratio vs residual range Calculated mean dEdx Geant4 extracted “mean” 5

  6. Reco agreement getting better? Geant4 MPV curve Calculated MPV curve Normalization? • (scatter points) same sample from Heng-Ye’s proton selection in a beam+cosmic sample  A global normalization issue? 6

  7. Impact from charge correction Lifetime correction: 35ms X correction YZ correction • It looks like lifetime correction gives consistent result • A fluctuation from X, YZ correction should be tiny 7

  8. Add the RC tail removal Lifetime correction: 35ms W/o tail removal Lifetime correction: 35ms W/ tail removal • Slightly better with the tail removal? Tiny impact. • Still have a normalization problem 8

  9. Backup 9

  10. dEdx for muon: WCP prediction Muon: geant4 truth Initial momentum 1GeV (KE ~ 0.9 GeV) mean MPV (dx = 0.5cm) Muon: geant4 truth https://lar.bnl.gov/properties/pass.html Crosscheck: (muon) RR = 100cm, mean dEdx = 2.1 10

  11. Single muon reco Energy calibration issue? 11

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