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HBD performance study during run9 pp 200GeV

HBD performance study during run9 pp 200GeV. Katsuro Nakamura. HBD Sdphi , Sdz stability check during Run-9. Sdphi , Sdz … distance between track and cluster, normalized with RMS used whole electron tracks in EWG_DST on CCJ. electron track selection. abs(bbcz)<20cm quality==31||51||63

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HBD performance study during run9 pp 200GeV

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  1. HBD performance study during run9 pp 200GeV Katsuro Nakamura

  2. HBD Sdphi, Sdzstability check during Run-9 • Sdphi, Sdz … distance between track and cluster, normalized with RMS • used whole electron tracks in EWG_DST on CCJ

  3. electron track selection • abs(bbcz)<20cm • quality==31||51||63 • pt>0.15GeV/c • n0>=2 • prob>0.01 • abs(emcsdphi_e)<4, abs(emcsdz_e)<4 • e/p>0.6 • hbdsize>=2

  4. Sdphi fitting • fit with gaus + pol1 • check the run dependence of mean and sigma of gaus

  5. Sdphi 0.0 < pt < 0.5 GeV/c 0.5 < pt < 1.0 GeV/c mean mean sigma sigma

  6. Sdphi 1.0 < pt < 1.5 GeV/c 1.5 < pt < 2.0 GeV/c mean mean sigma sigma

  7. Sdz fitting • fit with gaus + pol1 • check the run dependence of mean and sigma of gaus z

  8. Sdz 0.0 < pt < 0.5 GeV/c 0.5 < pt < 1.0 GeV/c mean mean • displacement • of mean value • recalibrate this value • (but this displacement is enough small to be ignored.) sigma sigma dynamical moving during run-9 ?

  9. Sdz after private recalibration 0.0 < pt < 0.5 GeV/c 0.5 < pt < 1.0 GeV/c mean mean new_sdz = (sdz - mean)/sigma sigma sigma

  10. Sdz 1.0 < pt < 1.5 GeV/c 1.5 < pt < 2.0 GeV/c mean mean sigma sigma

  11. Sdz after private recalibration 1.0 < pt < 1.5 GeV/c 1.5 < pt < 2.0 GeV/c mean mean sigma sigma

  12. Sdz private recalibration parameters

  13. HBD calibration check for electron track

  14. electron track selection • abs(bbcz)<20cm • quality==31||51||63 • pt>0.15GeV/c • n0>=2 • prob>0.01 • abs(emcsdphi_e)<4, abs(emcsdz_e)<4 • e/p>0.6 • hbdsize>=2 • abs(hbdsdphi)<4, abs(hbdsdz)<4

  15. electron track distribution pad id (0-origin): 96 97 98 …………… Sect 9 South • electron track dist. on sect9 is almost uniform. fill hbdcharge to the nearest pad from p = {phbdx, phbdy, phbdz}. ///////////////////////////////// int padnum = NearestPad(phbdx,phbdy,phbdz); hist[padnum]->Fill(hbdcharge); /////////////////////////////////

  16. I found the update of HbdWisClustrizer.C on CVS • HbdWisClustrizer.C • define clustering algorithm • HbdWisClustrizer.C –r1.12 (previously used) • cause nonuniform cluster peak distribution • detail is in slide sent to electron-l on 5/ 6/ 2010 •  update • HbdWisClustrizer.C –r1.16 (latest version) • looks fine!

  17. peak pad distribution after update pad id (0-origin): 96 97 98 …………… Sect 9 South • reasonable distribution fill hbdcharge to the peak pad in the cluster ////////////////////////// int max_pad = peak pad in the cluster; hist[max_pad]->Fill(hbdcharge); //////////////////////////

  18. sector-by-sector HBD charge dist. for single e and double e

  19. Dalitz Electron Pair Selection • Electron Selection • bbcz < 20 cm • quality==31||51||63 • pt>0.15GeV • n0>=2 • abs(emcsdphi)<4.0 , abs(emcsdz)<4.0 • prob>0.01 • e/p>0.6 • hbdsize>=2 • abs(hbdsdphi)<4.0 , abs(hbdsdz)<4.0 • Pair Selection • Mass<0.15GeV/c^2  select Dalitz region • PhiV cut  reject conversion pairs • Unlike sign

  20. Single e and Double e definition Single Double hbd_id(trk_i) == hbd_id(trk_j) trk_i trk_i • hbd_id(trk_i) != hbd_id(trk_j) trk_ j π π trk_ j notice: used HbdWisClusterizer.C –r1.12 in the following analysis

  21. HBD charge distribution (East Arm)for Dalitz event (Raw dist.) Sect Sect blue: single red : double 0 3 1 4 5 2 Direction N N S S

  22. HBD charge distribution (West Arm)for Dalitz event (Raw dist.) Sect Sect blue: single red : double 6 9 7 10 11 8 Direction S S N N

  23. HBD charge distribution (East Arm)for Dalitz event (normalized) Sect Sect • normalized with integral of entry blue: single red : double slightly worse slightly worse 0 3 difficult to use 1 4 5 2 Direction N N S S

  24. HBD charge distribution (West Arm)for Dalitz event (normalized) Sect Sect • normalized with integral of entry blue: single red : double 6 9 7 10 11 8 Direction S S N N

  25. comparing with the distribution made by Ilia pair mass ~ 0 field ~ 0 • good agreement e HBD charge distribution e+ HBD charge distribution D e- π Dalitz event Dalitz event single double by I.Ravinovichi

  26. For the next step • study Pt dependence of the ratio between single and double. • low pt  2 clusters tend to be separated • high pt  2 clusters tend to be merged • decide charge threshold sector-by-sector

  27. backup slide

  28. HBD scintillation charge distribution • fit with a0*exp(-x/a1) • a0 = const, a1 = slope fit on 2.5 ~ 5 [p.e.]

  29. run dependence of fitting slope • it’s stable • since it’s calibrated • no large difference on pad-by-pad • also “const” has no large difference HBD sect9 Yellow: pad107 Red: pad127 Blue: pad106 Green: pad105

  30. central pad in cluster pad id (0-origin): 96 97 98 …………… Sect 9 South • you can see the pad dependence of yielded charge

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