HLAB meeting
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Transcript of HLAB meeting
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HLAB meeting
Status report4Mar2014
Toshiyuki Gogami
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Experimental setup
Data summary
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Experimental setup
Data summary
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Definition of differential cross section
Number of virtual photonincluding HES acceptance
Number of target protons EfficienciesHKS acceptance
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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
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Systematic error for cross-section
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Systematic error for binding energy
With Initial matrices With tuned matrices
SIMULATION
SIMULATIONIn progress
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12C(e,e’K+)12ΛB spectrum
Count Cross sectionVirtual photon fluxEfficienciesAcceptance
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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)
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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
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7Li(e,e’K+)7ΛHe spectrum
Count Cross sectionVirtual photon fluxEfficienciesAcceptance
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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.
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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
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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.
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窒化テスト
窒化テストします電子天秤 環境ロガー
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END
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Backup
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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
]
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Contribution to missing mass resolution
One of results of blind analyses
Missing masses with initial matrices
Simply calculated by quadratic sum