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HES HKS meeting

HES HKS meeting. 8 Oct 2010 T.Gogami. Contents. H 2 O Missing mass tracking code POSITRON simulation. Λ. Acc. background. Missing Mass (H 2 O) From Shichijo’s ppt. D ebug. H 2 O target. +1 - +. 52 Cr. CH 2. H 2 O. 48% up. 40 % up. 16 % up. H 2 O target missing mass. CUT.

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HES HKS meeting

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  1. HES HKS meeting 8 Oct 2010 T.Gogami

  2. Contents • H2O Missing mass • tracking code • POSITRON simulation Λ Acc. background Missing Mass (H2O) From Shichijo’sppt

  3. Debug H2O target • +1 • - + 52Cr CH2 H2O 48% up 40% up 16% up

  4. H2O target missing mass CUT HES χ2 < 300 HKS χ2 < 300 Tracking code Λ OLD Λ NEW Tracking code • Number of event • S/N

  5. Ratio of number of Λ event • HES χ2 < 50 (Fixed) • HKS χ2 < x Much more event

  6. Simulationfor positron at target • POSITRON • Number • Angular distribution • Energy distribution e- ( 2.344 [GeV] ) Target 0.5 [cm] Virtual detector (4cm×4cm ) Thickness 1 [μm] 20000 events

  7. Angular distribution of e+ • event : e+ = 100k : 1 • 8 [μA] =5×1013 • Rate of e+ = 5×108 [Hz] = 500 [MHz] 52Cr target SIMULATION Generated 100M events HKS detect θ > 1° e+ generated in target should not be accepted in HKS ==>Background in HKS has other root

  8. Summary and to do • Summary • Tracking code modification • Lambda event up (H2O target) • Simulation around target • positron angular distribution • e+ generated in target should not be accepted in HKS • to do • Tracking code • background reject routine • POSITRON • Around target • H20 target model • Hall prove entrance • Real data • ADC

  9. e+ • Momentum > 800 [MeV] [rad] 100 M electron on target (52Cr)

  10. Angular distribution of e+ 12C target SIMULATION

  11. Pb

  12. e,e+ b.g. in HKS TOP view 5 × 5 [cm2] Side view HKS - D HKS - Q X’ [rad] X [cm]

  13. B.G mix rate in HKS trigger a just after pattern recognition ==>cut bad combination of space point (like TOF_pre) ==>CPU power , analysis time 52Cr (77124) b 12C (76077) 9Be (76607) 7Li (76184) . 10B (76184) B.G. mix rate = a/(a+b) ×1044 Developing

  14. Generated e+ in Simulation pe+ : 1.2±0.5 [GeV/c] θ : 0.124±0.124 [rad] φ : 2.64159±0.5 [rad] target : 12C 100[mg/cm2] HKS D magnet HKS D magnet Splitter magnet beam: spherical uniform generation no collimator EM flag on

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