hes-hks & kaos meeting 24/feb/2014 toshi gogami. contents 12 Λ b cross section comparison with...

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