HES-HKS & KaoS meeti ng

Toshi Gogami20/Sep/2012

最近• 8/20 - 8/25 FB20 in Fukuoka, Japan

– Electro-production of K+Λ at JLab Hall-C Proceedings ( in this month )

• 8/27 – 8/29 SNP12 in Osaka, Japan– No presentation.

• 9/2 – 9/7 Tours2012 in Black Forest, Germany– (poster) Lambda hypernuclear spectroscopy at JLab Hall-C

• 9/11 – 9/14 JPS meeting in Kyoto, Japan– JLabにおける高品質電子ビームを用いたラムダハイパー核分光実験の解析状況

• 10/1 – 10/6 HYP, JSPS Core to Core meeting in Barcelona, Spain– Lambda hypernuclear spectroscopy up to medium heavy mass number at Jefferson Lab資料 on Wiki http://lambda.phys.tohoku.ac.jp/~db/mediawiki/index.php/%E7%99%BA%E8%A1%A8%E8%B3%87%E6%96%99

Contents

• Λ , Σ0

– 2 bins in angular acceptance

K+Λ electro-production

JLab E05-115 (HES-HKS)192±6±89 [ nb / sr ]

p(e,e’K+)Λ~1.8MeV (FWHM)Δm = 19 ± 17 keV/c2

p(e,e’K+)Σ0

~1.8MeV (FWHM)Δm = 73 ± 47 keV/c2

JLab E05-115CH2, ~ 450 [mg/cm2]~ 2.0 [μA]~ 38 [hours]

Preliminary

HKS angular acceptance

Region 1 Region 2

θLabK at target

0.1 > θLabK 0.1 < θLab

K < 0.2

Solid angles of HKS

9th polynomial functions

Λ acceptance

Region 1

Region 2

SIMULATION

SIMULATION

SIMULATION

~ 8.5 msr

Missing mass spectra of polyethylene target

Region 1 Region 2

Missing mass spectra of polyethylene target

Region 2Region 1

Σ0

~2.2 msrΛ~5.7 msr

Σ0

~5.7 msr

Λ~2.9 msr

~ 300 nb/sr ~ 200 nb/sr

summary

• Doing further analysis