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HES-HKS & KaoS meeting

HES-HKS & KaoS meeting. Toshi Gogami 16/Aug/2012. 11Aug2012 @ Sendai Station. Contents. Current spectra Elementary process. p( e,e’K + ) Λ,Σ 0. p( e,e’K + )Λ ~ 2.0 MeV (FWHM) Δm ~ - 200 keV/c 2. p( e,e’K + )Λ ~1.8MeV (FWHM) Δm = 19 ± 17 keV/c 2. JLab E05-115

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HES-HKS & KaoS meeting

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  1. HES-HKS & KaoS meeting Toshi Gogami 16/Aug/2012 11Aug2012 @ Sendai Station

  2. Contents • Current spectra • Elementary process

  3. p(e,e’K+)Λ,Σ0 p(e,e’K+)Λ ~2.0MeV (FWHM) Δm~ -200keV/c2 p(e,e’K+)Λ ~1.8MeV (FWHM) Δm = 19 ± 17 keV/c2 JLab E05-115 CH2, ~ 450 [mg/cm2] ~ 2.0 [μA] ~ 38 [hours] p(e,e’K+)Σ0 ~1.8MeV (FWHM) Δm = 73 ± 47 keV/c2 p(e,e’K+)Σ0 ~1.8MeV (FWHM) Δm~ -100keV/c2 H2O CH2

  4. 12C(e,e’K+)12ΛB 12C low current 12C total sΛ: -11.34 ±0.12 , 2MeV FWHM (E01-011 : -11.40 ± 0.15) pΛ: - 0.47 ± 0.01 , 2Mev FWHM (E01-011 : -0.41±0.14)

  5. 7Li(e,e’K+)7ΛHe • 1st peak : -5.07 +- 0.19 MeV , 6 MeV (FWHM) ( woCSB-5.36 , wCSB-5.16 ) • 2nd peak : -3.20 +- 0.38 MeV , 5 MeV (FWHM) ( woCSB-3.7(-3.62) , wCSB-3.54(-3.41) )

  6. 10B(e,e’K+)10ΛBe • 1st peak : -8.06 +- 0.39 MeV , 5MeV (FWHM) ( woCSB-8.84 , wCSB-8.76 ) • 2nd peak : -6.00 +- 0.18 MeV , 4.4MeV (FWHM) ( woCSB-6.33 , wCSB-6.21 )

  7. 9Be(e,e’K+)9ΛLi • Replay have been done this morning. ~ 3 days

  8. 52Cr(e,e’K+)52ΛV

  9. 52Cr(e,e’K+)52ΛV 2 MeVくらい 浅くすると・・・

  10. Elementary process From FB20 presentation file

  11. The number of events of Λ and Σ0 JLab E05-115 CH2, ~ 450 [mg/cm2] ~ 2.0 [μA] ~ 38 [hours] Λ Σ0 4804± 111 (Integrated : -8~8 MeV/c2) 1103± 67 (Integrated : 72 ~ 83 MeV/c2)

  12. Momentum acceptance cut ~8.5 msr HES momentum region [ GeV/c ] 0.790 ~ 0.844 ( 1.922 < W [ GeV ] < 1.947 ) Λ Σ0

  13. Preliminary results of p(γ*,K+)Λ ( JLab E05-115 , Q2 ~ 0.01 [GeV/c]2 ) Preliminary JLab E05-115 (HES-HKS) 197±7±93 [ nb / sr ]

  14. Preliminary results of p(γ*,K+)Σ0 ( JLab E05-115 , Q2 ~ 0.01 [GeV/c]2 ) Preliminary JLab E05-115 (HES-HKS) 63±5±29 [ nb / sr ]

  15. Comparison with the results of Hall-A Not yet

  16. Summary and To do • Summary • Current spectra • 7Li , 10B , 12C , 52Cr targets • Elementary process (Λand Σ0) • Consistent with the tendency of results of SAPHIR and CLAS! • To do • Matrix tuning • How to get better resolution keeping the linearity • Do not forcebefore other optimizations • Energy loss(beam, e’ , K+) • Tracking • Include elimination of the correlation between kinetic parameters and Λ (Σ0) in the chi-square. • Elementary cross section • Hall-A results • More precise estimation of efficiencies and acceptance. • (Jacobian) • FB20 , SNP12 , Tours symposium , JPS , HYP+JSPS core2core

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