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HES HKS Analysis meeting

HES HKS Analysis meeting. 14/Dec/2012 @ JLab Toshi Gogami. Preliminary results of p(γ*,K + )Λ. ( JLab E05-115 , Q 2 ~ 0.01 [GeV/c] 2 ). Preliminary. JLab E05-115 (HES-HKS) 192±6±89 [ nb / sr ]. SAPHIR : K.H.Glander et al. , Eur. Phys. J. A 19, 251-273 (2004)

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HES HKS Analysis meeting

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  1. HES HKS Analysis meeting 14/Dec/2012 @ JLab ToshiGogami

  2. Preliminary results of p(γ*,K+)Λ ( JLab E05-115 , Q2 ~ 0.01 [GeV/c]2 ) Preliminary JLab E05-115 (HES-HKS) 192±6±89 [ nb / sr ] SAPHIR : K.H.Glander et al. , Eur. Phys. J. A 19, 251-273 (2004) CLAS : R.Bradford et al. , Phys. Rev. C 73, 035202 (2006) JPS meeting in Kyoto , Toshi Gogami

  3. Definition of cross section • The number of VP • Including HES solid angleand acceptance • Solid angle of HKS • Event by event New way to estimate

  4. VP flux factor Jab E05-115 , Polyethylene target • Γ ( Ee, ω , θe’ ) • Ee = 2.344 GeV • ω = 1.5 GeV θe’ (lab)

  5. VP flux factor vs. p and θ ~ 0.01 HES HKS ~ 0.087

  6. Integrated VP flux factor

  7. VP flux factor Jab E05-115 , Polyethylene target 3 2 4 5 1 6 7 Divided into 7 regions θe’ (lab)

  8. VP flux factor Jab E05-115 , Polyethylene target 3 2 4 5 1 6 7 Divided into 7 regions 0.0160 0.0024 0.0081 0.0043 Q2 [GeV]2 0.0035 0.0058 0.0115

  9. Γ  Γ’ ( Region 4 ) Γ ~ 0.065 [ / GeV / sr / Ne ] Γ’ ~ 3.5543× 10-6 [ /Ne ] SIMULATION Number of VP ~ 6.2818×1012 ± 4.05189×1010 0.790 – 0.844 GeV/c ( 1.922 < W < 1.947 GeV)

  10. Results

  11. Angular dependence SAPHIR : K.H.Glander et al. , Eur. Phys. J. A 19, 251-273 (2004) CLAS : R.Bradford et al. , Phys. Rev. C 73, 035202 (2006)

  12. Q2 dependence

  13. Q2 dependence SAPHIR : K.H.Glander et al. , Eur. Phys. J. A 19, 251-273 (2004)

  14. Coincidence cut for 52Cr • TCut cut_1 = "abs(ctime+54.6)<1.0 && 75976.5<runnum && runnum<76049.5"; • TCutcut_2 = “abs(ctime+54.8)<1.0 && 76716.5<runnum&&runnum<76802.5"; • TCutcut_3 = "abs(htimetar-etimetar+54.9)<1.0 && (76845.5<runnum && runnum<76937.5)"; • TCut cut_41 = "abs(htimetar-etimetar+54.9)<1.0 && (76947.5<runnum && runnum<77064.5)"; • TCutcut_42 = "abs(htimetar-etimetar+54.3)<1.0 && (runnum>77064.5)";

  15. END

  16. Comparison with data of JLab Hall-A Large longitudinal term contributions? Preliminary p(γ*,K+)Λ ~ JLab E94-107 W ~ 2.2 GeV Q2 ~ 0.07 [GeV/c]2 p(γ*,K+)Λ ~ JLab E05-115 (HES-HKS) W ~ 1.9 GeV Q2 ~ 0.01 [GeV/c]2 SAPHIR : K.H.Glander et al. , Eur. Phys. J. A 19, 251-273 (2004) CLAS : R.Bradford et al. , Phys. Rev. C 73, 035202 (2006) JLab E94-107 : P.Markoviz et al. , Proceedings of SENDAI08 (2009) JPS meeting in Kyoto , Toshi Gogami

  17. Considered efficiencies Simulation JPS meeting in Kyoto , Toshi Gogami

  18. P. Bydzovsky’s presentation at ECT* 2011 K+ production at small angles electroproduction SL: 0.41 = 0.35 + 0.004 - 0.001 + 0.06 ( e = 0.7 ) a steep Q2 dependence ? (g*,K+) JLab Hall-A E05-115 W=1.9 GeV Q2=0.01 (GeV/c)2 JPS meeting in Kyoto , Toshi Gogami

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