e-pair search in csd tsutomu fukuda nagoya-univ

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e-pair Search in CSD Tsutomu Fukuda Nagoya-univ.

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e-pair Search in CSD

Tsutomu Fukuda

Nagoya-univ.

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

Position difference vs Angle difference (BG)

dr

da

DATA vs BGDATA Estimated BG

da da

dr dr

DATA vs BGDATA Estimated BG

Manual check : compton trk make ghost.

da da

dr dr

Where is e-pair ?

CSD

PL01

PL06

~ 6.5mm (~1X0)

~ 4.2mm

dr

da

Where is e-pair ?

CSD

PL01

PL06

~ 4.2mm

dr

da

~ 6.5mm (~1X0)

39030

● DATA● BG

e-pair

14850

● DATA● BG

Comptonsmake ghost

Film edgeXray mark

Comptonsmake ghost

Summary

• For searching e-pair in CSD , I propose one of technique of analysis.

• I will develop this technique.

Other CSD

16660

● DATA● BG

16918

● DATA● BG

16919

● DATA● BG

16969

● DATA● BG

17023

● DATA● BG

20122

● DATA● BG

31638

● DATA● BG

33540

● DATA● BG

34406

● DATA● BG

34841

● DATA● BG

38537

● DATA● BG

39031

● DATA● BG

41586

● DATA● BG

41613

● DATA● BG

50855

● DATA● BG

51264

● DATA● BG

53486

● DATA● BG

54963

● DATA● BG