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Vertex Location Reports from Nagoya

Vertex Location Reports from Nagoya. Umut Kose On the behalf of Nagoya Scanning Group. U. Kose. OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY. CSD found. Black CS. direct VTX hunting method. scan back location method. Scan around TT prediction point (CC) 4cmx5cmx5plates.

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Vertex Location Reports from Nagoya

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  1. Vertex Location Reports from Nagoya Umut Kose On the behalf of Nagoya Scanning Group U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  2. CSD found Black CS direct VTX hunting method scan back location method Scan around TT prediction point (CC) 4cmx5cmx5plates scan back volume scan around VTX prediction point (~1cm*1cm*10plates)‏ volume scan around stop plate (~1cm*1cm*6plates)‏ Finding the TT related track, do scan back.. not found VTX search partner & parent search Volume Scan around stop plate (1cmx1cmx5plates) found VTX located Decay Search Vertex location method U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  3. Scan Back Location Direct Vertex Hunting ECC CS 55% 45% U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  4. VTX located 160 Stopped in ECC 195 penetrating In progress 16 35 Edge out 4 Failed 25 VTX located 65 In progress 10 Summary of event location.. ScanBack 240 In progress ECC arrived 18 415 In a few days Failed 270 15 just arrived 19 thickness 48 CS rescan… 46 Direct Vertex 121 225 events vertex confirmed (176 CC events + 49 NC events) U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  5. Edge event 23413110 10816 CC 0.015 0.11564765.7 269.3 exit_pl_36 (22) 225199260 24729 CC 0.417 0.048248.029490.0exit_pl_12 (46) 235009260 72466 CC -0.154 0.063 122543.2 16369.3 exit_pl_27 (31) 236878908 49041 CC 0.037 -0.113 53819.9 98595.7 exit_pl_46 (12) U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  6. # of events 12% All events CC events NC events # of plates 225 events vertex confirmed (176 CC events + 49 NC events) Downstream  Upstream U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  7. # of events Multiplicity distribution U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  8. Y(mm) Vertex position distributions X(mm) U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  9. Location of Black CS events.. Test done by Yoshida.. U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  10. U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  11. Black CS Scan around TT prediction point (CC) 4cmx5cmx5plates Finding the TT related tracks, do scan back.. Volume Scan around stop plate (1cmx1cmx5plates) Strategy for Black CS events Selection: at least 3 plate connections, for CC use muon slope informations from TT U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  12. 230465150 13499 CC located 2332845523657 CC failed 233334842 8282 CC located 234387666 3392 CC located 7 Bricks with black CS 4 CC events have been tried and 3 events have been confirmed… U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  13. 下から39枚目で別の飛跡を検出 鉛中でμ候補と交わる（1.2micronまで接近する） 下流5枚のうち3枚以上で繋がったμ飛跡候補を追い上げる 下から39枚目までつながり、40枚目で無かった 下から39枚目で別の飛跡を検出 鉛中でμ候補と交わる（1.2micronまで接近する） 下から39枚目で別の飛跡を検出 鉛中でμ候補と交わる（1.2micronまで接近する） 下流5枚のうち3枚以上で繋がったμ飛跡候補を追い上げる 下流5枚のうち3枚以上で繋がったμ飛跡候補を追い上げる 234387666 3392 CC 下から39枚目までつながり、40枚目で無かった 下から39枚目までつながり、40枚目で無かった

  14. Vertex plate at pl36 Scanback to find the stopping plate 1st 5 plate data set 2 real tracks found muon 230465150 13499 CC

  15. Summary • Until now we have received 415 ECC • Vertex have been confirmed for 225 events (176 CC ; 49 NC).. • Test location analysis have been done for Black CS events, 4 CC events tried and 3 of them located.. - Decay search and detail analysis of the events is going on (see Yoshioka`s talk) U. Kose OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY

  16. Recieved CS 815 Scanned CS 718 Good candidate CS 476 Recieved ECC 415 VTX confirmed 225

  17. Direct VTX hunting • Selected track is Rank-A or B. • Assumed momentum of each track is 1.5GeV/c. • Recognition of VTX is below 1sigma. • If muon is exist, VTX is searched below 3sigma.

  18. Direct VTX Hunting Status DVH Rank (A,B,C). A B C Good  A: 25% (58/229)  DVH B: 23% (53/229)  SBL C: 22% (51/229)  SBL RMSdx,dy (A,B) ~ 1mm Delta-Plate : 1.5(A), 4.5(B) Rank A Rank B

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