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Analysis of Λ/Σ0 Cross Sections and VP Flux in JLab E05-115: HES/HKS Collaboration Meeting

This document summarizes the findings from the HES/HKS collaboration meeting held on May 1, 2012. Key topics include the cross-section calculations for Λ and Σ0 particles from JLab E05-115 experiments, analysis of VP flux using GEANT4 simulations, and the identification of bugs in the seed file generator affecting angular acceptance. The report also provides insights into the number of accumulated events, VP efficiencies, and data simulation results, further supporting ongoing research in particle physics.

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Analysis of Λ/Σ0 Cross Sections and VP Flux in JLab E05-115: HES/HKS Collaboration Meeting

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  1. HES-HKS & KaoS meeting 1/May/2012 Toshi Gogami 30Apr2012, Yagiyama shrine

  2. Contents • Λ/Σ0 cross section from CH2 target runs • Calculation of VP flux (GEANT4 simulation) • Found bugs in seed file generator • Angles are forwarder than that should be

  3. The number of events of Λ and Σ0 JLab E05-115 CH2, ~ 450 [mg/cm2] ~ 2.0 [μA] ~ 38 [hours]  Cross sections VP flux, efficiencies 5532± 75 (Integrated : 5 – 9 MeV/c2) 1434± 39 (Integrated : 72 – 86 MeV/c2)

  4. Bugs HES/ gen/vp/ vpflux.cc

  5. Difference a few % HES angular acceptance Simulation

  6. Virtual photon flux ROOT File : ./root2/vp2344all_H_small_merged.root The number of acc. events : 7260 +- 85.2056 VP flux [ 1/electrons ] : 1.97047e-05 +- 2.33026e-07 The number of electrons : 1.7545e+18 Total number of VP : 3.45719e+13 Simulation 少！ (cut conditions?) Dir : /data/8b/gogami/HAKO/svnroot/simulation/geant4/trunk/HES/ana/cs_ch2

  7. HYP2012 & FB20 • HYP2012 (http://www.phys.kyushu-u.ac.jp/fb20/venue.html) • Registration (by 15th Sep) is done • FB20 (http://www.phys.kyushu-u.ac.jp/fb20/venue.html) • Registration (by 18th Aug) is done • Abstract submission (by 15th May)

  8. Preparation for HES/HKS collaboration meeting on 9-11/May • E01-011(やる) • TOSCA + GEANT • Cross sections of Λ/Σ0 (今日明日) • The number of events • VP flux • Efficiencies • Analysis strategy for the high multiplicity data (あるもので発表)

  9. END 30Apr2012, 仙台の朝

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