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Z mass resolution release 17 Data/MC based on the MC with realistic Rt, A lines and errors

Z mass resolution release 17 Data/MC based on the MC with realistic Rt, A lines and errors. Niels van Eldik, Peter Kluit, Alan Poppleton Muon week 16 November discussed at MATF 2 November. Z mass ID-ID Based on the v35 processing compared to release 17 Rt + A + Error.

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Z mass resolution release 17 Data/MC based on the MC with realistic Rt, A lines and errors

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  1. Z mass resolution release 17Data/MCbased on the MC with realistic Rt, A lines and errors Niels van Eldik, Peter Kluit, Alan Poppleton Muon week 16 November discussed at MATF 2 November

  2. Z mass ID-IDBased on the v35 processing compared to release 17 Rt + A + Error

  3. Z mass CB-CBData MC rel 17 comparison Reasonable agreement additional smearing needed

  4. Z mass CB-CB MuidRt A lines and errors

  5. Z mass SA-SAData MC rel 17 comparison Not so good agreement….

  6. Z mass SA-SA MuidRt A lines and errors

  7. MS-ID momentumData MC comparison: Barrel Barrel Large η 1.1 and Small sectors η 1.0 Excellent agreement Data/MC

  8. MS-ID momentumTransition region Transition Large η 1.4 and Small η 1.7 sectors Not so good agreement with MC: Transition region is worse in data

  9. MS-ID momentum Endcap Endcap rest η range < 2.0 Large and Small Reasonable agreement: small sectors a bit worse than Large

  10. MS-ID momentum CSC Need More statistics Endcap rest η range < 2.0 Large and Small Reasonable agreement: small sectors slightly worse

  11. MS-ID momentum pull Barrel Pull distribution agrees very well Data/MC

  12. MS momentum error Barrel Momentum error distribution for SA track: pretty similar

  13. MS-ID momentum pull Transition Not so good agreement in this region (see also dp/p in T region)

  14. MS momentum error Transition Error distribution SA track is similar Data/MC

  15. MS-ID momentum pull Endcap Some small differences e.g. Small Chambers

  16. MS momentum error Endcap Tendency that error in MC is smaller

  17. MS-ID momentum pull CSC Reasonable agreement except for Small

  18. MS momentum error CSC Error distribution SA track is different for Data/MC (this is known: due to CSC hit errors. In data there are less unspoiled clusters)

  19. MS-ID momentum< 3 station tracks

  20. Conclusions • Significant improvement in Data/MC agreement using the simulation including realistic Rt smearing, A lines and errors. • Performed further checks • Mass ID/CB/SA • Comparing dp/p = (pSA – pID) / pID and dp/error • Expected momentum error • Barrel looks in excellent shape • Transition region: MC is too optimistic in dp/p (p error OK) • Endcap region: 5-10% discrepancy in dp/p; p error a bit too optimistic • CSC region: some discrepancy dp/p. Probably due to the fact that the CSC hit errors are not correctly simulated (in data there are more spoiled clusters) • < 3 station tracks need more smearing • Efficiency cross check: MC with/without RtAE lines differ < 0.1%

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