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9May2012 – 11May2012 Department of Physics, Graduate School of Science, Tohoku Univ.

JLab hypernuclear collaboration meeting / JSPS Core to Core Seminar Analysis Status of Heavy targets data of HES-HKS. 9May2012 – 11May2012 Department of Physics, Graduate School of Science, Tohoku Univ. Toshi yuki Gogami. Contents. Data summary & rate conditions

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9May2012 – 11May2012 Department of Physics, Graduate School of Science, Tohoku Univ.

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  1. JLab hypernuclear collaboration meeting/ JSPS Core to Core SeminarAnalysis Status of Heavy targets data of HES-HKS 9May2012 – 11May2012 Department of Physics, Graduate School of Science, Tohoku Univ. Toshiyuki Gogami HES/HKS collaboration meeting, T.Gogami

  2. Contents • Data summary & rate conditions • Improvement we did for high multiplicity data • What need to be done • Tracking code of HES • Optimization of cut conditions in the tracking stage • Parameter tune ( x-t function of drift chambers ) • Summary HES/HKS collaboration meeting, T.Gogami

  3. Contents • Data summary & rate conditions • Improvement we did for high multiplicity data • What need to be done • Tracking code of HES • Optimization of cut conditions in the tracking stage • Parameter tune ( x-t function of drift chambers ) • Summary H2O 52Cr CH2 12C Targets after the experiment HES/HKS collaboration meeting, T.Gogami

  4. Data Summary JLab E05-115 (2009/June – 2009/Nov) HES/HKS collaboration meeting, T.Gogami

  5. e , e+ background in GEANT simulation HKS • Generated particle : e+ • Distribution : spherical uniform • Momentum : 860 – 1000 [MeV/c] • Angle : 0 – 2 [mrad] • 1000 events KDC1 KDC2 e- , e+ Vacuum chamber (sus304) e+ NMR port (sus304) HES/HKS collaboration meeting, T.Gogami

  6. Rates of the HKS TOF detectors HES/HKS collaboration meeting, T.Gogami

  7. Multiplicity of typical layer of chamber HKS HES ~1.13 ~2.24 ~4.94 ~1.28 HES/HKS collaboration meeting, T.Gogami

  8. Contents • Data summary & rate conditions • Improvement we did for high multiplicity data • What need to be done • Tracking code of HES • Optimization of cut conditions in the tracking stage • Parameter tune ( x-t function of drift chambers ) • Summary HES/HKS collaboration meeting, T.Gogami

  9. Discrepancy of Number of Λ (Before new tracking code adoption) CH2 Target H2O Target Λ Λ • The number of Λ • NΛ ¼ Nexpect • The number of Λ • NΛNexpect Lost events that we are interested in in tracking procedure. Very preliminary Very preliminary Σ0 Σ0 12C quasi-free 16O quasi-free Acc. b.g. Acc. b.g. REAL DATA REAL DATA Black : hit wires Blue : selected wires Red : track Black : hit wires Blue : selected wires Red : track HES/HKS collaboration meeting, T.Gogami

  10. Results of Introduction of new Tracking Code CH2 • NΛ¼ Nexpect  NΛ½ Nexpect Increased ! 52Cr Increased ! H2O HES/HKS collaboration meeting, T.Gogami

  11. Contents • Data summary & rate conditions • Improvement we did for high multiplicity data • What need to be done • Tracking code of HES • Optimization of cut conditions in the tracking stage • Parameter tune ( x-t function of drift chambers ) • Summary Event display of HES detectors HES/HKS collaboration meeting, T.Gogami

  12. Drift Chamber plane efficiency YES YES YES YES YES • Other requirements • HKS • 1X&1Y&2X • HES • EH1&EH2 Extracted Track No No HES/HKS collaboration meeting, T.Gogami

  13. Tracking efficiency • HKS (KDC1 & KDC2) • 5/6 & 5/6 • HES (EDC1) • 8/10 • ・・・・・・ • ・・・・・・ • ・・・・・・ HES/HKS collaboration meeting, T.Gogami

  14. Analyzed runs *ch276323763247632576326763277637676377763787637976380 *b76124761257612676127761287628576286762877628876289 *cr1 75997759987599976000760017601676017760187601976020 *li76197761987619976200762017627176272762737627476275 *h2o75902759037590475908759097597175972759737597475975 *c75951759527595375954759677683976840768417684276843 *be76589765907659176592765947662976630766317663276633 *cr2 77098770997710077101771027712077121771227712377124 HES/HKS collaboration meeting, T.Gogami

  15. Tracking efficiency • ~~~~ HKS (5/6 & 5/6)~~~~~~~ch2 : Tracking Efficiency : 0.998974 +- 0.00760814 (0.761596%)h2o : Tracking Efficiency : 0.961109 +- 0.00190445 (0.198152%)li : Tracking Efficiency : 0.996378 +- 0.0205954 (2.06703%)be : Tracking Efficiency : 0.995274 +- 0.00535923 (0.538468%)b : Tracking Efficiency : 0.99921 +- 0.00912634 (0.913356%)c : Tracking Efficiency : 0.987929 +- 0.00179032 (0.181219%)cr1 : Tracking Efficiency : 0.974892 +- 0.00304261 (0.312097%)cr2 : Tracking Efficiency : 0.965851 +- 0.00320905 (0.332251% ) • ~~~~ HES (8/10) ~~~~~~~ch2 : Tracking Efficiency : 1 +- 0.00527844 (0.527844%)h2o : Tracking Efficiency : 1 +- 0.00095474 (0.095474%)li : Tracking Efficiency : 1 +- 0.0172701 (1.72701%)be : Tracking Efficiency : 1 +- 0.00419163 (0.419163%)b : Tracking Efficiency : 1 +- 0.00820523 (0.820523%)c : Tracking Efficiency : 1 +- 0.00153384 (0.153384%)cr1 : Tracking Efficiency : 1 +- 0.00100727 (0.100727%)cr2 : Tracking Efficiency : 1 +- 0.00103985 (0.103985%) 1 ….!? Need to check the tracking code If there is a bias to use 10/10, 9/10 and 8/10 are possible to be thrown. HES/HKS collaboration meeting, T.Gogami

  16. Contents • Data summary & rate conditions • Improvement we did for high multiplicity data • What need to be done • Tracking code of HES • Optimization of cut conditions in the tracking stage • Parameter tune ( x-t function of drift chambers ) • Summary HES/HKS collaboration meeting, T.Gogami

  17. Events which are discarded KDC2 KDC1 52Cr, 77124 HES/HKS collaboration meeting, T.Gogami

  18. Events which are discarded KDC2 • Where and why are these events discarded ? • Are these events threw away by correct cut condition? KDC1 52Cr, 77124 HES/HKS collaboration meeting, T.Gogami

  19. Events which are discarded KDC2 ~10% up • Where and why are these events discarded ? • Are these events threw away by correct cut condition? KDC1 52Cr, 77124 h_pattern_recognition.f HES/HKS collaboration meeting, T.Gogami

  20. Contents • Data summary & rate conditions • Improvement we did for high multiplicity data • What need to be done • Tracking code of HES • Optimization of cut conditions in the tracking stage • Parameter tune ( x-t function of drift chambers ) • Summary HES/HKS collaboration meeting, T.Gogami

  21. x-t function calibration Fitting Function Black : |WC-TC| Magenta : Profile of |WC-TC| Green : x-t calc. Track Track coordinate Wire center 0 s Drift distance |Wire center – Track coordinate| HES/HKS collaboration meeting, T.Gogami

  22. x-t calibration for 52Cr Target • Residuals better • KDC1 ; 400 [μm]  300 [μm] • Number up • ~10% increased at χ2 <20 • (~5% increased without χ2 cut) χ2 cut condition HES/HKS collaboration meeting, T.Gogami

  23. Contents • Data summary & rate conditions • Improvement we did for high multiplicity data • What need to be done • Tracking code of HES • Optimization of cut conditions in the tracking stage • Parameter tune ( x-t function of drift chambers ) • Summary HES/HKS collaboration meeting, T.Gogami

  24. Summary & What we need to do • Parameter tune • x-t function calibration • TOF counters calibration • Cut condition optimization • Optimization of the cuts in the tracking code • Tracking code of HES • Too good tracking efficiency • Prefer 10/10 events ? • Estimate hidden efficiencies • Miss identification rate in the tracking stage • By using GEANT simulation • Trigger efficiency (TOF, AC over kill, TUL.....) HES/HKS collaboration meeting, T.Gogami

  25. END JLab E05-115 collaboration, 2009, JLab Hall-C HES/HKS collaboration meeting, T.Gogami

  26. Rates of the KDC Layers CH2, 76314 KDC2 KDC1 ~3 MHz ~6 MHz HES/HKS collaboration meeting, T.Gogami

  27. Rates of the KDC Layers H2O, 75971 KDC2 KDC1 ~10 MHz ~20 MHz HES/HKS collaboration meeting, T.Gogami

  28. Rates of the KDC Layers 52Cr, 76314 KDC2 KDC1 ~11 MHz ~22 MHz HES/HKS collaboration meeting, T.Gogami

  29. Rates of the KDC wires CH2, 76314 KDC1-u KDC1-u’ KDC1-x KDC1-x’ KDC1-v KDC1-v’ < 150 kHz < 120 kHz Rate [kHz] Wire Number KDC2-u’ KDC2-x KDC2-x’ KDC2-v KDC2-v’ KDC2-u < 70 kHz < 60 kHz HES/HKS collaboration meeting, T.Gogami

  30. Rates of the KDC wires H2O, 75971 KDC1-u KDC1-u’ KDC1-x KDC1-x’ KDC1-v KDC1-v’ < 450 kHz < 270 kHz Rate [kHz] Wire Number KDC2-u’ KDC2-x KDC2-x’ KDC2-v KDC2-v’ KDC2-u < 250 kHz < 200 kHz HES/HKS collaboration meeting, T.Gogami

  31. Rates of the KDC wires 52Cr, 77124 KDC1-u KDC1-u’ KDC1-x KDC1-x’ KDC1-v KDC1-v’ < 510 kHz < 350 kHz Rate [kHz] Wire Number KDC2-u’ KDC2-x KDC2-x’ KDC2-v KDC2-v’ KDC2-u < 290 kHz < 230 kHz HES/HKS collaboration meeting, T.Gogami

  32. x-t calibration for H2O Target • Residual better • Number up • 10% increased at χ2 <20 HES/HKS collaboration meeting, T.Gogami

  33. Singles rate summary HKS Up to ~30 [MHz] HKS trigger ~ 10[kHz] HES Up to ~15 [MHz] COIN 2.0 [kHz] HES trigger ~ a few[MHz] HKS-HES Collaboration Meeting, T.Gogami

  34. B.G. mix rate (real data) b a B.G mix rate = HKS-HES Collaboration Meeting, T.Gogami * hks ntulpe

  35. e+ simulation • To see • Number of event • Angle & momentum of e+ generated in target SIMULATION HKS-HES Collaboration Meeting, T.Gogami

  36. Target thickness dependence(Simulation) SIMULATION H2O 52Cr 9Be 12C CH2 10B 7Li Consistent with B.G. mix rate ! HKS-HES Collaboration Meeting, T.Gogami

  37. Tracking in HKS(pattern recognition) y y • Make combination of hit wire belong to one space point for tracking • pre tracking x x Test point Space point HKS-HES Collaboration Meeting, T.Gogami

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