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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. - PowerPoint PPT Presentation
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HLAB meeting
Status report4Mar2014
Toshiyuki Gogami
Experimental setup
Data summary
Experimental setup
Data summary
Definition of differential cross section
Number of virtual photonincluding HES acceptance
Number of target protons EfficienciesHKS acceptance
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 errorSystematic error click here
Systematic error for cross-section
Systematic error for binding energy
With Initial matrices With tuned matrices
SIMULATION
SIMULATIONIn progress
12C(e,e’K+)12ΛB spectrum
Count Cross sectionVirtual photon fluxEfficienciesAcceptance
Λ binding energy for 12C(e,e’K+)12ΛB
Peak - BΛ [MeV] N [nb/sr]1 -11.380.02 76528 97.83.611.52 -8.390.05 14912 19.01.52.23 -5.200.09 13511 17.21.42.04 -1.700.07 9410 12.01.31.45 -0.430.03 65826 84.13.39.96 0.470.06 21014 26.81.73.2
(FWHM: 500 keV)
12ΛB comparison
Experiment
θγKLab [degree] -BΛ [MeV] Cross section [nb/sr] Extracted value from
Motoba-san’s predictionE05-115 6.8 -11.38 ± 0.02 ± sys. error 97.8 ± 3.6 ± 11.5 75
E01-011 5.8 -11.40 ± 0.01 ± 0.04 101 ± 4.2 (+ 38 – 31) 85
E89-009 0 -11.52 ± 0.35 140 ± 17 ± 18 120
Emulsion -11.37 ± 0.06 N/A
SΛ
Experiment
θγKLab [degree] -BΛ [MeV] Cross section [nb/sr] Extracted value from
Motoba-san’s prediction
E05-115 6.8 -0.43 ± 0.03 ± sys. error 84.1 ± 3.3 ± 9.9 85
E01-011 5.8 -0.41 ± 0.01 ± 0.13 94 ± 4.0 ±35 96
E89-009 -0.49 ± 0.16 N/A
pΛ
7Li(e,e’K+)7ΛHe spectrum
Count Cross sectionVirtual photon fluxEfficienciesAcceptance
Λ binding energy for 7Li(e,e’K+)7ΛHe
E01-011: -5.680.030.25 MeV
Peak - BΛ [MeV] N [nb/sr]1 -5.740.10 45021 17.30.82.82 -3.840.16 38220 14.70.82.4
(FWHM: 1300 keV)
-5.36 without CSB-5.16 with CSBHiyama’s calc.
Λ binding energy for 7Li(e,e’K+)7ΛHe
E01-011: -5.680.030.25 MeV
(FWHM: 1300 keV)
-5.36 without CSB-5.16 with CSBHiyama’s calc.
Peak - BΛ [MeV] N [nb/sr]
1 -5.740.10 45021 17.30.82.8
2 -3.840.16 38220 14.70.82.4
About Lithium target thickness
ELOG Entry: 185809Lithium 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 lossFor cross-section
A photograph before mounting already black….. Nitride ? Lithium nitridation test will be done.
窒化テスト
窒化テストします電子天秤 環境ロガー
END
Backup
Gaussian fitting
Gaussian fit 8020 events (/10000)
~80% counting efficiency
SIMULATION (after matrix tuning)12C, 87.5 mg/cm2
12ΛB (-BΛ=-11.37 MeV)
[GeV]
[ Cou
nts
/ 100
keV
]
Contribution to missing mass resolution
One of results of blind analyses
Missing masses with initial matrices
Simply calculated by quadratic sum
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