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e-pair Search in CSD

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

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

  2. 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.

  3. 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

  4. 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

  5. Position difference vs Angle difference (BG) da dr

  6. DATA vs BG DATA Estimated BG da da dr dr

  7. DATA vs BG DATA Estimated BG da da dr dr Manual check : compton trk make ghost.

  8. Where is e-pair ? da PL06 ~ 6.5mm (~1X0) PL01 ~ 4.2mm CSD dr

  9. Where is e-pair ? da PL06 ~ 6.5mm (~1X0) PL01 ~ 4.2mm CSD dr

  10. 39030 ● DATA ● BG e-pair

  11. 14850 Comptons make ghost ● DATA ● BG Xray mark Film edge Comptons make ghost

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

  13. Other CSD

  14. 16660 ● DATA ● BG

  15. 16918 ● DATA ● BG

  16. 16919 ● DATA ● BG

  17. 16969 ● DATA ● BG

  18. 17023 ● DATA ● BG

  19. 20122 ● DATA ● BG

  20. 31638 ● DATA ● BG

  21. 33540 ● DATA ● BG

  22. 34406 ● DATA ● BG

  23. 34841 ● DATA ● BG

  24. 38537 ● DATA ● BG

  25. 39031 ● DATA ● BG

  26. 41586 ● DATA ● BG

  27. 41613 ● DATA ● BG

  28. 50855 ● DATA ● BG

  29. 51264 ● DATA ● BG

  30. 53486 ● DATA ● BG

  31. 54963 ● DATA ● BG

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