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HLAB meeting

HLAB meeting. Status report 4Mar2014 Toshiyuki Gogami. Experimental setup. Data summary. Experimental setup. Data summary. Definition of differential cross section. Number of target protons. Efficiencies. HKS acceptance. Number of virtual photon including HES acceptance.

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HLAB meeting

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  1. HLAB meeting Status report 4Mar2014 Toshiyuki Gogami

  2. Experimental setup Data summary

  3. Experimental setup Data summary

  4. Definition of differential cross section Number of target protons Efficiencies HKS acceptance Number of virtual photon including HES acceptance

  5. Efficiencies and correction factors • Efficiencies • DAQ • Trigger • Tracking • K+ selection • AC, WC, m2, • Correction factors • K+ decay (momentum dependent) • Solid angle (momentum dependent) • K+ absorption • Event loss due to matrix and energy loss • Small effect for hypernucelus  systematic errors • Acceptance (real and simulation) • Small discrepancy  systematic error Systematic error  click here

  6. Systematic error for cross-section

  7. Systematic error for binding energy In progress SIMULATION SIMULATION With Initial matrices With tuned matrices

  8. 12C(e,e’K+)12ΛB spectrum Count Cross section Virtual photon flux Efficiencies Acceptance

  9. Λ binding energy for 12C(e,e’K+)12ΛB (FWHM: 500 keV)

  10. 12ΛB comparison SΛ pΛ

  11. 7Li(e,e’K+)7ΛHe spectrum Count Cross section Virtual photon flux Efficiencies Acceptance

  12. Λbinding energy for 7Li(e,e’K+)7ΛHe E01-011: -5.680.030.25 MeV (FWHM: 1300 keV) -5.36 without CSB -5.16 with CSB Hiyama’s calc.

  13. Λbinding energy for 7Li(e,e’K+)7ΛHe E01-011: -5.680.030.25 MeV (FWHM: 1300 keV) -5.36 without CSB -5.16 with CSB Hiyama’s calc.

  14. About Lithium target thickness ELOG  Entry: 185809 Lithium 7 (325.2mg, 0.982cm2 331.2mg/cm2) Thickness of Lithium is 3.9mm, using density of 0.535g/cm3, it is 207mg/cm2. For energy loss For cross-section A photograph before mounting  already black…..Nitride ? Lithium nitridation test will be done.

  15. 窒化テスト 電子天秤 窒化テストします 環境ロガー

  16. END

  17. Backup

  18. Gaussian fitting SIMULATION (after matrix tuning) 12C, 87.5 mg/cm2 12ΛB (-BΛ=-11.37 MeV) [ Counts / 100 keV] Gaussian fit  8020 events (/10000) ~80% counting efficiency [GeV]

  19. Contribution to missing mass resolution Simply calculated by quadratic sum Missing masses with initial matrices One of results of blind analyses

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