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Cross-check of lepton track momentum

Cross-check of lepton track momentum. Andrea Venturi. Renaud’s results. About 100-170 MeV discrepancy in electron TPC momentum observed in Z Bhabha events (1998) Cross-check with my ntuples used for track distortion measurements and with di-muon events. Event selection and reconstruction.

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Cross-check of lepton track momentum

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  1. Cross-check of lepton track momentum Andrea Venturi Lepton momentum- Andrea Venturi - W meeting

  2. Renaud’s results • About 100-170 MeV discrepancy in electron TPC momentum observed in Z Bhabha events (1998) • Cross-check with my ntuples used for track distortion measurements and with di-muon events Lepton momentum- Andrea Venturi - W meeting

  3. Lepton momentum- Andrea Venturi - W meeting

  4. Event selection and reconstruction • Preselection: • 2-6 good charged tracks • two leading tracks with |cos|<0.95 • Bhabha selection: 4 selections • E(ecal)/P > 0.7 for at least one track • E(ecal)/Ebeam > 0.7 for both tracks • as 2. + P/Ebeam > 0.4 for both tracks • “Renaud’s selection”: • P1+P2 > 0.2*sqrt(s) • E(ecal)1+E(ecal)2> 0,45*sqrt(s) • sum(E(ecal)+E(hcal)+P) > 1.4*sqrt(s) • |cos *|<0.9 • Di-muon selection: 2 selections • mu-id or ECAL mips for both tracks • as 1. + P/Ebeam > 0.7 for both tracks • No background (so far) • Sagitta correction applied to data and no change to MC • sagitta corrections and distortion simulation are relevant only if charge is looked at. Lepton momentum- Andrea Venturi - W meeting

  5. data with PCOR MC standard +ve -ve Lepton momentum- Andrea Venturi - W meeting

  6. data no PCOR MC with distortions MC std +ve -ve Lepton momentum- Andrea Venturi - W meeting

  7. data with PCOR MC with distortions and PCOR MC std +ve -ve Lepton momentum- Andrea Venturi - W meeting

  8. Bhabha selection 1 Barrel Lepton momentum- Andrea Venturi - W meeting

  9. Bhabha selection 2 Barrel Lepton momentum- Andrea Venturi - W meeting

  10. Bhabha selection 3 Barrel Lepton momentum- Andrea Venturi - W meeting

  11. Bhabha selection 4 Barrel Lepton momentum- Andrea Venturi - W meeting

  12. Di-muon s selection 1 Barrel Lepton momentum- Andrea Venturi - W meeting

  13. Di-muon s selection 2 Barrel Lepton momentum- Andrea Venturi - W meeting

  14. To be investigated • Dependence on the selection • background • correlations among sub-detectors • Tails • lower tail • background • upper tail • resolution: 1/p is gaussian  non-linearity • Fit distribution peak • resume already existing results • Polar angle biases • pz • B field ? • Aim to simulate the effect for systematic studies Lepton momentum- Andrea Venturi - W meeting

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