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HES-HKS analysis meeting. 7 Feb2014 Toshi Gogami. Contents. Blind analysis Systematic erro r for B Λ. Event generation. HES. Imitation data. POSI. Coincidence. background. HKS. Matrices Detector resolutions. Beam Energy loss Raster. e’, K + energy losses Acceptance.
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HES-HKS analysis meeting 7Feb2014 ToshiGogami
Contents Blind analysis • Systematic error for BΛ
Event generation HES Imitation data POSI Coincidence • background HKS • Matrices • Detector resolutions • Beam Energy loss • Raster • e’, K+ energy losses • Acceptance
Event generation Distorted HES Imitation data POSI Coincidence • background HKS • Matrices • Detector resolutions • Beam Energy loss • Raster • e’, K+ energy losses • Acceptance
Tuning conditions • Event selection • Λ, Σ0 : ± 1σ • 12ΛB g.s. : ± 2σ • Backgrounds • Λ, Σ0 : Realistic distributions and S/N • 12ΛB g.s. : Uniform distribution and realistic S/N • Tuning (five iterations a loop)
Before and after matrix tuning SIMULATION SIMULATION With Initial matrices With tuned matrices
Results (fitting meanand width) FWHM ΔMean (M - Mgen) Λ, Σ0 : ~1500 keV 7ΛHe: ~1000 keV Others: 500 – 750 keV ± 100 keV
Differential non-linearity Before tuning 12 SIMULATION ΔMHYP (M - Mgen) After tuning
Differential non-linearity 12ΛB Missing mass [GeV/c2]
Differential non-linearity 7ΛHe 52ΛV 12ΛB Missing mass [GeV/c2]
Differential non-linearity 7ΛHe 12ΛB 52ΛV
Differential non-linearity ΔBΛ100 keV 7ΛHe 12ΛB 52ΛV
Summary Blind analysis • Systematic error 100 keV (from tuning code)
Number of events after matrix tuning うまく数勘定ができる!
Missing mass distribution without target 7ΛHe Missing mass [GeV] Missing mass [GeV] Target z [cm]
Missing mass distribution without target δpK [GeV] δpe’ [GeV] Target z [cm] Target z [cm] Z-dep HES 起因
Missing mass distribution without target Δx’e’ [GeV] Δx’e’ [GeV] Target z [cm] Missing mass [GeV]