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Preliminary Results on Elementary Processes in Kaon Production from JLab E05-115

This document presents preliminary findings from the JLab experiment E05-115, focusing on the elementary processes of kaon production, specifically analyzing reaction channels involving Λ and Σ0 baryons. Detailed spectra and mass resolutions for various reactions, including p(e,e'K+)Λ and p(e,e'K+)Σ0, are discussed. The study involves varied targets such as 7Li, 10B, 12C, and 52Cr, integrating data from extended measurements to investigate the momentum acceptance and cross sections. Results align with tendencies observed in previous experiments.

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Preliminary Results on Elementary Processes in Kaon Production from JLab E05-115

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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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