Vertex Location Reports from Nagoya Umut Kose On the behalf of Nagoya Scanning Group 1 OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY U. Kose Vertex location method CSD found Black CS direct VTX hunting method scan back location method scan back volume scan volume scan around VTX prediction point (~1cm*1cm*10plates) around stop plate (~1cm*1cm*6plates) VTX search not found Scan around TT prediction point (CC) 4cmx5cmx5plates Finding the TT related track, do scan back.. partner & parent search found VTX located Volume Scan around stop plate (1cmx1cmx5plates) Decay Search OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY 2 U. Kose From CS scanning results 1 track Multi-tracks Direct Vertex Hunting 37.8 % 62.2 % Scan Back Location ECC CS 55% 45% 3 OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY U. Kose Summary of event location.. VTX located Stopped in ECC ScanBack 240 160 195 penetrating 16 ECC arrived In progress In progress 35 Edge out 4 18 415 In a few days Failed 25 Failed 15 just arrived 19 thickness 48 CS rescan… 46 270 VTX located 65 Direct Vertex 121 In progress 10 225 events vertex confirmed (176 CC events + 49 NC events) 4 OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY U. Kose Edge event 23413110 10816 CC 0.015 0.115 64765.7 225199260 24729 CC 0.417 0.048 248.0 235009260 72466 CC -0.154 0.063 122543.2 236878908 49041 CC 0.037 -0.113 53819.9 269.3 exit_pl_36 (22) 29490.0 exit_pl_12 (46) 16369.3 exit_pl_27 (31) 98595.7 exit_pl_46 (12) 5 OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY U. Kose # of events Downstream Upstream 12% All events CC events NC events # of plates 225 events vertex confirmed (176 CC events + 49 NC events) 6 OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY U. Kose # of events Multiplicity distribution 7 OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY U. Kose Y(mm) Vertex position distributions X(mm) 8 OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY U. Kose Location of Black CS events.. Test done by Yoshida.. 9 OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY U. Kose 10 OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY U. Kose Strategy for Black CS events Black CS Scan around TT prediction point (CC) 4cmx5cmx5plates Finding the TT related tracks, do scan back.. Volume Scan around stop plate (1cmx1cmx5plates) Selection: at least 3 plate connections, for CC use muon slope informations from TT 11 OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY U. Kose 7 Bricks with black CS 4 CC events have been tried and 3 events have been confirmed… 230465150 13499 CC located 233284552 3657 CC failed 233334842 8282 CC located 234387666 3392 CC located 12 OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY U. Kose 下から39枚目で別の飛跡を検出 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) 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 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 μ飛跡候補を追い上げる 234387666 3392 CC 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 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 230465150 13499 CC Vertex plate at pl36 Scanback to find the stopping plate 1st 5 plate data set muon 2 real tracks found 14 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) 15 OPERA Collaboration Meeting 1-3 April 2009, Ankara/TURKEY U. Kose 16 Recieved CS 815 Scanned CS 718 Good candidate CS 476 Recieved ECC 415 VTX confirmed 225 18 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. 19 Direct VTX Hunting Status DVH Rank (A,B,C). A B C Good Delta-Plate : 1.5(A), 4.5(B) A: 25% (58/229) DVH B: 23% (53/229) SBL C: 22% (51/229) SBL RMSdx,dy (A,B) ~ 1mm Rank A Rank B 20
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