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
Slide 3
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
Slide 4
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
Slide 24
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
Slide 25
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
Slide 26
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
Slide 27
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
Slide 28
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
Slide 29
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
Slide 30
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
Slide 31
center region cut select tracks passing good region on HBD 31
accept region accept region 26.5cm 22.9cm 18.0cm 14.0cm
Slide 32
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
Slide 33
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
Slide 34
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