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Vertex location status of Japan

Vertex location status of Japan. Nagoya vertex hunting team Y.Nonoyama, K.Hamada, S.Takahashi, H.Kubota, R.Komatani 2009 Jan 22 OPERA Japan Meeting. Our history. Yoshiaki Nonoyama (Doctor course student): Refresh (set up Temp and Humi monitor system) PEANUT

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Vertex location status of Japan

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  1. Vertex location status of Japan Nagoya vertex hunting team Y.Nonoyama, K.Hamada, S.Takahashi, H.Kubota, R.Komatani 2009 Jan 22 OPERA Japan Meeting

  2. Our history Yoshiaki Nonoyama (Doctor course student): Refresh (set up Temp and Humi monitor system) PEANUT Kaname Hamada (Doctor course student): Refresh Improve mechanical accuracy of S-UTS stage Develop track reconstruction soft-ware Satoru Takahashi (Doctor course student): DONUT Refresh Gamma-ray telescope with Emulsion Chamber Hirotaka Kubota (Doctor course student): Refresh Fragmentation of heavy-ion Gold deposition development Ryosuke Komatani (Muster course student): Develop online data process soft-ware

  3. VTX location method direct VTX hunting scan back & volume scan scan back volume scan around VTX prediction point (~1cm*1cm*10plates) volume scan around stop plate (~1cm*1cm*6plates) not found VTX search partner & parent search found VTX located

  4. status table in Japan re-glycerin, wait sheeting 21 waiting scanning 40 28 CS 19 CS->ECC under analysis 42 14 ECC arrived scan back 276 0 scanning in progress 22.Dec. arrived 38 109 volume scan +61 (5.Jan. arrived) 62 under analysis black CS 14 e-shower down plate single stop 5 VTX located 114 black ECC finished 10 127 another brick 13

  5. Vertex plate(CC,NC) ALL CC NC PL down-stream up-stream

  6. Vertex plate(SB,DVH) ALL SB DVH PL down-stream up-stream SB : Scan Back Location DVH : Direct Vertex Hunting

  7. Vertex position distribution(all plate) Y(mm) X(mm)

  8. Number of shower tracks/interaction ALL CC Mean = 3.4 tracks NC N tracks

  9. Angle distribution of shower tracks qy qx(rad)

  10. Lock on decay search Check track exist or not. (data and eyes) If stop then look for parent or partner between 1mm of lead vertex point vertex point xz-projection yz-projection This is “decay search sheet”. Vertex plate and down 2~3plate is most important plate(decay trigger plate). These tracks are corrected by less than IP<=200mm from vertex point. First we check real stop then look for parent or 2nd vertex. All young people rock on decay search.

  11. Summary • We located 114 interactions out of 276 ECCs. • Under analysis events for vertex confirm are “stop down plate”, “e-shower” and “single stop”. • About stop down plate events, maybe scan-backed low-energy track. • About e-shower events, it should be scan up plates. • About single-stop events, it should be parent search and confirm real stop by eyes. • We start decay search. • A decay candidate is found. But very preliminary. • This event stopped PL3, so now request down-stream ECC. • Up to next meeting we can show final result about this event.

  12. Back up

  13. Event : 235646940 Brick : 41517 Type : CC Now request next brick

  14. Under analysis events Event : 234787942 Brick : 151760 Type : CC m m Maybe partner track make large angle. So it needs large angle scanning (tanq ~ 1 ).

  15. Under analysis events : e-shower Event : 234787942 Brick : 151760 Type : CC

  16. Under analysis events : e-shower

  17. stop plate1~2 volume scan under analysis 2 single stop 14 7 e-shower 5

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