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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.

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e pair search in csd

e-pair Search in CSD

Tsutomu Fukuda

Nagoya-univ.

why using e pair
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
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
Estimate BG pair made by random Noise

# of pairs

< 500micron

< 40mrad

● 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)

* (0.04rad)2π/(1.3rad)2*NCSDTrk

# of CSD trks

data vs bg
DATA vs BG

DATA

Estimated BG

da

da

dr

dr

data vs bg1
DATA vs BG

DATA

Estimated BG

da

da

dr

dr

Manual check : compton trk make ghost.

where is e pair
Where is e-pair ?

da

PL06

~ 6.5mm

(~1X0)

PL01

~ 4.2mm

CSD

dr

where is e pair1
Where is e-pair ?

da

PL06

~ 6.5mm

(~1X0)

PL01

~ 4.2mm

CSD

dr

39030
39030

● DATA

● BG

e-pair

14850
14850

Comptons

make ghost

● DATA

● BG

Xray mark

Film edge

Comptons

make ghost

summary
Summary
  • For searching e-pair in CSD , I propose one of technique of analysis.
  • I will develop this technique.
16660
16660

● DATA

● BG

16918
16918

● DATA

● BG

16919
16919

● DATA

● BG

16969
16969

● DATA

● BG

17023
17023

● DATA

● BG

20122
20122

● DATA

● BG

31638
31638

● DATA

● BG

33540
33540

● DATA

● BG

34406
34406

● DATA

● BG

34841
34841

● DATA

● BG

38537
38537

● DATA

● BG

39031
39031

● DATA

● BG

41586
41586

● DATA

● BG

41613
41613

● DATA

● BG

50855
50855

● DATA

● BG

51264
51264

● DATA

● BG

53486
53486

● DATA

● BG

54963
54963

● DATA

● BG