e-pair search in csd tsutomu fukuda nagoya-univ
Post on 21-Dec-2015
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TRANSCRIPT
Why using e-pair?
• e-pair is from nu-int. → Brick finding
• By using e-pair ( request parallelism between 2trks), we can reject a few too many BG.
• In other words, we can pick up trks at high efficiency. For example, we can use 3/4CSD Trk or BaseTrk, of course 4hold Trk.
• For Direct VTX hunting in down stream event.
Search e-pair in CSD Trk• This time, I use ¾ CSD Trk.• Scanning Area is 121mm x 95mm.• Data set is 23CSD/15event.
• < 500micron, < 40mrad → e-pair candidate
Number of CSD Trk
Estimate BG pair made by random Noise
# of CSD trks
# of pairs
● is Estimated MC BG.- is Poisson distribution.
< 500micron
< 40mrad
Pn = mn/n! * e-m
P0 = e-m
Npair = NCSDTrk*(1-P0) = NCSDTrk*(1-e-m)
m=(500micron)2π/(121mm * 95mm)* (0.04rad)2π/(1.3rad)2*NCSDTrk
Summary
• For searching e-pair in CSD , I propose one of technique of analysis.
• I will develop this technique.