HES-HKS & KaoS meeting 24/Feb/2014 Toshi Gogami. Contents 12 Λ B cross section Comparison with Motoba-san’s calculation Acceptance Linearity after matrix.

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Presentation transcript:

HES-HKS & KaoS meeting 24/Feb/2014 Toshi Gogami

Contents 12 Λ B cross section Comparison with Motoba-san’s calculation Acceptance Linearity after matrix tuning (blind analysis)

Differential cross section of 12 Λ B by Motoba-san DWIA, E γ = 1.5 GeV

Differential cross section predicted by Motoba-san Motoba-san’s calc. 12 Λ B g.s. (1 -, 2 - ) θ Lab γK [degree] [nb/sr]

Angular distribution in simulation (θ Lab γK ) SIMULATION Motoba-san’s calc. 12 Λ B g.s. (1 -, 2 - ) θ Lab γK [degree] Normalized intensity θ Lab γK [degree] [Counts]

Predicted cross section in our acceptance SIMULATION Mean values θ Lab γK [degree] [nb/sr] Value used for comparison !!

Cross-section comparison θ γK [degree]Experimental results [nb/sr] Motoba’s calculation [nb/sr] E ± 3 ± sys. error75 E (hand calc.)101 ± 4.2 (+ 38 – 31)85

Acceptance

Events for acceptance comparison CH 2 target Λ (± 8 MeV) ( One of spectra during blind analysis ) Missing mass [GeV/c 2 ] [Counts / (200keV/c 2 )]

HES side

HES side (log scale) Out of range X [cm] Y [cm] [Counts]

HES side (linear scale) Out of range X [cm] Y [cm] [Counts]

HKS side

HKS side (log scale) X [cm] Y [cm] X [cm] Y [cm] [Counts]

HKS side (linear scale) X [cm] Y [cm] X [cm] Y [cm] [Counts]

Linearity after tuning  systematic error

Differential non-linearity SIMULATION ΔM HYP (M - M gen )

Differential non-linearity Missing mass [GeV/c 2 ]

Differential non-linearity Missing mass [GeV/c 2 ]

Differential non-linearity

Differential non-linearity (10B, 12C, 52Cr)

他 Tuning with 7 Λ He Li 標的 写真 : 黒い  すでに窒化しているっぽい Blind analysis Differential non-linearity Another pattern of distortion 解析 Finalizing 52 Λ V どうするか

Backup

Sample used for cross section study Assumed binding energy of MeV SIMULATION

Differential cross section predicted by Motoba-san Motoba-san’s calc. 12 Λ B g.s. (1 -, 2 - ) θ Lab γK [degree] [nb/sr]

Angular distribution in simulation (θ Lab γK ) SIMULATION Motoba-san’s calc. 12 Λ B g.s. (1 -, 2 - ) θ Lab γK [degree] Normalized intensity θ Lab γK [degree] [Counts]

Predicted cross section in our acceptance SIMULATION Mean values θ Lab γK [degree] [nb/sr] Value used for comparison !!

Cross-section comparison θ γK [degree]Experimental results [nb/sr] Motoba’s calculation [nb/sr] E ± 3 ± sys. error75 E (hand calc.)101 ± 4.2 (+ 38 – 31)85

Differential cross section by Motoba-san Motoba-san’s calc. 12 Λ B g.s. (1 -, 2 - )

Angular distribution (θ Lab γK ) SIMULATION

Angular distribution (θ Lab γK ) SIMULATION Motoba-san’s calc. 12 Λ B g.s. (1 -, 2 - ) θ Lab γK [degree] Normalized intensity

Predicted cross section in our acceptance SIMULATION 7.4 degree 6.8 degree 74.7 nb/sr

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