hes-hks & kaos meeting 24/feb/2014 toshi gogami. contents 12 Λ b cross section comparison with...
DESCRIPTION
Differential cross section of 12 Λ B by Motoba-san DWIA, E γ = 1.5 GeVTRANSCRIPT
HES-HKS & KaoS meeting
24/Feb/2014Toshi Gogami
Contents
• 12ΛB cross section• Comparison with Motoba-san’s calculation
• Acceptance• Linearity after matrix tuning (blind analysis)
Differential cross section of 12ΛB by
Motoba-sanDWIA , Eγ = 1.5 GeV
Differential cross section predicted by Motoba-san
Motoba-san’s calc.12
ΛB g.s. (1- , 2-)
θLabγK [degree]
[nb/
sr]
Angular distribution in simulation (θLab
γK)Accepted events by HES-HKS with uniform generation
Expected distribution(Weighted by prediction)
SIMULATION
Motoba-san’s calc.12
ΛB g.s. (1- , 2-)
θLabγK [degree]
Nor
mal
ized
inte
nsity
θLabγK [degree]
[Cou
nts]
Predicted cross section in our acceptance
SIMULATION SIMULATION
Accepted events by HES-HKS with uniform generation
Expected distribution(Weighted by prediction)
6.8 degree7.4 degree
Mean values
75 nb/sr75 nb/sr
θLabγK [degree] [nb/sr]
Value usedfor comparison !!
Cross-section comparison
θγK [degree] Experimental results[nb/sr]
Motoba’s calculation [nb/sr]
E05-115 6.8 83 ± 3 ± sys. error 75E01-011 5.8 (hand calc.) 101 ± 4.2 (+ 38 – 31) 85
Acceptance
Events for acceptance comparison
CH2 targetΛ (± 8 MeV)
Real data
SIMULATION( One of spectra during blind analysis )
Missing mass [GeV/c2]
Missing mass [GeV/c2]
[Cou
nts /
(200
keV/
c2 )]
HES side
HES side (log scale)
Real data
SIMULATION
Real data
SIMULATION
Nout_of_range /Ntot = 3×10-4
1%
Out of rangeX [cm]
X [cm] Y [cm]
Y [cm]
[Cou
nts]
[Cou
nts]
[Cou
nts]
[Cou
nts]
HES side (linear scale)
Real data
SIMULATION
Real data
SIMULATION
Nout_of_range /Ntot = 3×10-4
1%
Out of rangeX [cm]
X [cm] Y [cm]
Y [cm]
[Cou
nts]
[Cou
nts]
[Cou
nts]
[Cou
nts]
HKS side
HKS side (log scale)
Real data
SIMULATION
Real data
SIMULATION
1.7×10-3
1.0×10-3 1.7×10-4
X [cm] Y [cm]
X [cm] Y [cm][C
ount
s][C
ount
s]
[Cou
nts]
[Cou
nts]
HKS side (linear scale)
Real data
SIMULATION
Real data
SIMULATION
1.7×10-3
1.0×10-3 1.7×10-4
X [cm] Y [cm]
X [cm] Y [cm][C
ount
s][C
ount
s]
[Cou
nts]
[Cou
nts]
Linearity after tuning systematic error
Differential non-linearity
SIMULATION12
Before tuning
After tuningΔMHY
P (M
- M
gen)
Differential non-linearity
Missing mass [GeV/c2]
12ΛB
Differential non-linearity
Missing mass [GeV/c2]
12ΛB
7ΛHe 52
ΛV
Differential non-linearity
12ΛB7
ΛHe 52ΛV
Differential non-linearity
12ΛB7
ΛHe 52ΛV
ΔBΛ 100 keV
Differential non-linearity (10B, 12C, 52Cr)
他• Tuning with 7
ΛHe• 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
ΛV どうするか
Backup
Sample used for cross section study
Assumed binding energy of 11.37 MeV
SIMULATION
Differential cross section predicted by Motoba-san
Motoba-san’s calc.12
ΛB g.s. (1- , 2-)
θLabγK [degree]
[nb/
sr]
Angular distribution in simulation (θLab
γK)Accepted events by HES-HKS with uniform generation
Expected distribution(Weighted by prediction)
SIMULATION
Motoba-san’s calc.12
ΛB g.s. (1- , 2-)
θLabγK [degree]
Nor
mal
ized
inte
nsity
θLabγK [degree]
[Cou
nts]
Predicted cross section in our acceptance
SIMULATION SIMULATION
Accepted events by HES-HKS with uniform generation
Expected distribution(Weighted by prediction)
6.8 degree7.4 degree
Mean values
75 nb/sr75 nb/sr
θLabγK [degree] [nb/sr]
Value usedfor comparison !!
Cross-section comparison
θγK [degree] Experimental results[nb/sr]
Motoba’s calculation [nb/sr]
E05-115 6.8 83 ± 3 ± sys. error 75E01-011 5.8 (hand calc.) 101 ± 4.2 (+ 38 – 31) 85
Differential cross section by Motoba-san
Motoba-san’s calc.12
ΛB g.s. (1- , 2-)
Angular distribution (θLabγK)
Uniform generation
SIMULATION
Angular distribution (θLabγK)
Uniform generation
Expected distribution
SIMULATION
Motoba-san’s calc.12
ΛB g.s. (1- , 2-)
θLabγK [degree]
Nor
mal
ized
inte
nsity
Predicted cross section in our acceptance
Uniform generation
SIMULATION SIMULATION
Expected distribution
7.4 degree6.8 degree
74.7 nb/sr