1 / 14

Investigating Lepton Track Momentum Discrepancies in Bhabha Events: Analysis by Andrea Venturi

This presentation by Andrea Venturi focuses on the cross-checking of lepton track momentum in Z Bhabha events, highlighting a notable discrepancy in electron TPC momentum ranging from 100 to 170 MeV. The analysis integrates various selection processes, including Bhabha and di-muon selections, ensuring effective event reconstruction. Findings include comparisons of momentum correction methods and potential background influences, aiming to enhance accuracy in lepton momentum measurements. The work seeks to align theoretical predictions with empirical data results.

iain
Télécharger la présentation

Investigating Lepton Track Momentum Discrepancies in Bhabha Events: Analysis by Andrea Venturi

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related