e-pair Search in CSD

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# e-pair Search in CSD - PowerPoint PPT Presentation

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.

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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 pairs

< 500micron

● is Estimated MC BG.

－is Poisson distribution.

Pn = mn/n! * e-m

P0 = e-m

Npair = NCSDTrk*(1-P0)

= NCSDTrk*(1-e-m)

m=(500micron)2π/(121mm * 95mm)

# of CSD trks

DATA vs BG

DATA

Estimated BG

da

da

dr

dr

DATA vs BG

DATA

Estimated BG

da

da

dr

dr

Manual check : compton trk make ghost.

Where is e-pair ?

da

PL06

~ 6.5mm

(~1X0)

PL01

~ 4.2mm

CSD

dr

Where is e-pair ?

da

PL06

~ 6.5mm

(~1X0)

PL01

~ 4.2mm

CSD

dr

39030

● DATA

● BG

e-pair

14850

Comptons

make ghost

● DATA

● BG

Xray mark

Film edge

Comptons

make ghost

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