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HBD Meeting 2010 / 11/ 24 Katsuro 1

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confirmation plan for HBD simulation performances 2 HBD charge distribution Red: merged cluster Blue: separated cluster important features of HBD compare HBD charge distribution for single electrons cluster size distribution for single electrons need to check these distributions

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clustering algorithm 3 HBD charge [p.e.] seed pad seed pad seed pad Clustering Algorithm make a cluster with seed pads add neighbor pads to the cluster cluster charge is the sum of pad charges seed pad: pad with large charge (> 3p.e.) SNSN

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Run Selection and Electron Cut reject runs including many dead pads on HBD gain looks reasonable electron cut abs(bbc_z) < 20cm quality==31|51|63 n0>=2 e/p cut ecore>0, mom>0 abs(emcsdphi_e)

change offline pad charge threshold apply new offline pad charge cut pad charge > 3 p.e. (old threshold: 1p.e.) reject online threshold effect reject inhomogeneous efficiency on pad online threshold 23

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HBD size distribution cell charge cut (>3p.e.) (East) 24 low eff. low stat. not stable Black: Dalitz data (single e cluster) Green: J/psi data (unlike - like) Red: simulation HBD Sect 1 SHBD Sect 1 N HBD Sect 2 SHBD Sect 2 N HBD Sect 3 SHBD Sect 3 N HBD Sect 4 SHBD Sect 4 N

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HBD size distribution cell charge cut (>3p.e.) (West) 25 low stat. Black: Dalitz data (single e cluster) Green: J/psi data (unlike - like) Red: simulation HBD Sect 7 SHBD Sect 7 N HBD Sect 8 SHBD Sect 8 N HBD Sect 9 SHBD Sect 9 N HBD Sect 10 SHBD Sect 10 N HBD Sect 11 SHBD Sect 11 N

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HBD size distribution. (East) center cut && cell charge cut (>3p.e) 26 low eff. low stat. not stable Black: Dalitz data (single e cluster) Green: J/psi data (unlike - like) Red: simulation HBD Sect 1 SHBD Sect 1 N HBD Sect 2 SHBD Sect 2 N HBD Sect 3 SHBD Sect 3 N HBD Sect 4 SHBD Sect 4 N

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HBD size distribution (West) center cut && cell charge cut (>3p.e.) 27 low stat. Black: Dalitz data (single e cluster) Green: J/psi data (unlike - like) Red: simulation HBD Sect 7 SHBD Sect 7 N HBD Sect 8 SHBD Sect 8 N HBD Sect 9 SHBD Sect 9 N HBD Sect 10 SHBD Sect 10 N HBD Sect 11 SHBD Sect 11 N

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HBD cell charge distribution creating HBD pad charge distribution for single electron track seed pad seed pad seed pad reconstructed electron track e HBD cell charge entry/#{e track} fill cell charge to histo scaled by the number of e tracks integral is equivalent to average cluster size 28

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HBD cell charge distribution (East) Black: data Green: J/psi (unlike like ) Red: simulation low eff. low stat. not stable 29 HBD Sect 1 SHBD Sect 1 N HBD Sect 2 SHBD Sect 2 N HBD Sect 3 SHBD Sect 3 N HBD Sect 4 SHBD Sect 4 N

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HBD cell charge distribution (West) Black: data Green: J/psi (unlike like ) Red: simulation low stat. 30 HBD Sect 7 SHBD Sect 7 N HBD Sect 8 SHBD Sect 8 N HBD Sect 9 SHBD Sect 9 N HBD Sect 10 SHBD Sect 10 N HBD Sect 11 SHBD Sect 11 N

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center region cut select tracks passing good region on HBD 31 accept region accept region 26.5cm 22.9cm 18.0cm 14.0cm

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HBD cell charge distribution center region cut (East) Black: data Green: J/psi (unlike like ) Red: simulation low eff. low stat. not stable 32 HBD Sect 1 SHBD Sect 1 N HBD Sect 2 SHBD Sect 2 N HBD Sect 3 SHBD Sect 3 N HBD Sect 4 SHBD Sect 4 N

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HBD cell charge distribution center region cut (West) Black: data Green: J/psi (unlike like ) Red: simulation low stat. 33 HBD Sect 7 SHBD Sect 7 N HBD Sect 8 SHBD Sect 8 N HBD Sect 9 SHBD Sect 9 N HBD Sect 10 SHBD Sect 10 N HBD Sect 11 SHBD Sect 11 N

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discussion HBD cluster charge distribution is roughly consistent but cluster size distributions seem not to be consistent gain-adjustment makes a consistent in cluster-size distributions of data and simulation ??? HBD simulator Cherenkov photon generate photo-electrons on CsI generate a gain with a probability distribution (exp (+gaus)) for each photo-electron changing exponential slope (=gain) ??? 34