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Status of Event Analysis from Nagoya Scanning Group OPERA Emulsion Workshop

This report presents the findings from the OPERA Emulsion Workshop held in January 2008 in Nagoya, Japan, focusing on the analysis of neutrino events. A total of 19 events were recorded, including 15 charged current (CC) and 4 neutral current (NC) events from Japan. The specifics of event analysis for multiple tracks, brick scanning results, and the manual verification of tracks are detailed. Notable measurements, including Kalman slopes and event projections, provide insights into the event characteristics and their implications for neutrino physics.

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Status of Event Analysis from Nagoya Scanning Group OPERA Emulsion Workshop

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  1. Status of Located Event Analysis Umut KOSE On behalf of Nagoya Scanning Group OPERA Emulsion Workshop, 22-23 January 2008, Nagoya, JAPAN

  2. 38 Opera neutrino events  19 (EU), 19 (JP) • 19 events 15 CC + 4 NC events in Japan • 7 events analyzed.

  3. CC-eventBrick #: 53486 Event 18154300

  4. Ev18154300 Brick#53486

  5. Ev18154300 Brick#53486

  6. Ev18154300 Brick#53486

  7. Ev18154300 Brick#53486

  8. Ev18154300 Brick#53486 Event 181543007 1st brick 0.98 SM Wall, side, row, cell 1 20 1 46 17 Brick N., status 1053486 0 Kalman: slopes X,Y -0.26779601 -0.381244987 K: Extrapolation 119.332855 98.674118 -521.834045 K: dist. from borders evt x,y mm class 181543007 39.484375 38.375 3 K: Coordinates in emu. frame x,y mm 39.484375 61.4248047 Linear slopes X,Y -0.265368491 -0.340315163 Linear extrap X,Y,Z 118.968155 97.4809113 -521.834045 Linear coordinates in emu. frame x,y mm 35.8374023 49.4926758

  9. Ev18154300 Brick#53486 Large scanning Area (122mm x 95.5mm) And no angular selection 4 hold selection and 8 tracks sent to manual check and found 6 tracks. Found Tracks angle and position 1) (-0.116, -0.476) (33.0 , 74.0) 2) (-0.171, -0.188) (31.3 , 84.6 ) 3) ( 0.186, 0.057) (40.3 , 94.2) 4) ( 0.608, -0.088) (45.1 , 92.0) 5) ( 0.604, 0.133) (54.4 , 92.6 ) 1 track isolated 6) (-0.373, 0.441) (59.7 , 21.1 ) cosmic ray?

  10. Ev18154300 Brick#53486

  11. Ev18154300 Brick#53486 Ev181543007 Brick#53486

  12. Ev18154300 Brick#53486 58 emulsion films have been found

  13. Ev18154300 Brick#53486 ScanBack location result SB location 2 times tried, in the first trial SB stopped at pl 25 in the second stopped at pl 51.

  14. Ev18154300 Brick#53486 NetScan Data Analysis at stopping plate 25 X-projection muon Z-projection Y-projection

  15. Ev18154300 Brick#53486 • 8 tracks sent to manual scan (9 tracks found at 1ry) 25 -0.1293 -0.2064 36054.0 90855.3 --- 25 -0.1023 -0.4940 36069.7 90706.7 1.72 25 0.0504 0.1043 36133.5 90999.6 3.43 25 -0.2856 0.2756 35969.7 91099.9 4.66 25 -0.2047 -0.6125 36016.2 90646.5 0.95 25 0.1440 0.6340 36187.4 91272.1 2.04 25 0.0011 -0.0251 36109.0 90944.9 }-->epair *25 -0.0003 0.0174 36107.2 90950.1 }-->epair *25 0.0585 0.0980 36133.1 91002.1 23 0.4242 -0.0414 37471.3 90591.6 *found during manual scan..

  16. Ev18154300 Brick#53486 • 8 tracks have been sent to manual scan (plate 25 in lead), 9 tracks have been found at 1ry vertex 1ry vertex positons: 36119.9 90966.1 517.3 e-pair .. 36107.7 90957.6 132.0 FL = 385.6 micron, Opening angle: 0.044rad. One more neutral 2ndry at plate 23 ??? FL ~ 3100micron, parent slope: (0.430;-0.120)

  17. Ev18154300 Brick#53486 Found in CSD Muon track Edge out in pl 3 Exist in CSD Pl 11; 2ndry interaction with 3 black, 1shower track, shower found in CSD

  18. Ev18154300 Brick#53486

  19. Ev18154300 Brick#53486 SB first trial

  20. Ev18154300 Brick#53486 SB second trial

  21. Ev18154300 Brick#53486 Base --> dx: 169.9 ; dy: -215.0 Up --> dx: 168.0 ; dy: -214.5 Down --> dx: 163.0 ; dy: -210.6 • Checking SB track and follow down track at pl2 and 1. pl2 106177 -0.1634 -0.1805 B 210085 -0.1540 -0.1806 31845.7 85522.3 M 320000 -0.1692 -0.1907 31840.7 85521.4 71136 -0.1634 -0.1298 M 320000 -0.1886 -0.1760 31670.8 85736.4 pl1 106177 -0.1634 -0.1805 M 320000 -0.1733 -0.1980 31786.3 85524.4 71136 -0.1886 -0.1760 M 320000 -0.1905 -0.1799 31613.0 85745.4 SB > 937581 2 125813 -0.179853 -0.167776 31681.9 85724.7 220079 110052 110027 -0.2254 -0.2368 -0.2039 -0.2063 Follow > 937601 2 78441 -0.166576 -0.186486 31851 85514.5 180051 80011 100040 -0.1648 -0.2444 -0.1951 -0.2328 SB > 778196 1 71136 -0.1827 -0.1697 31628.4 85694.9 210099 110064 100035 -0.1831 -0.2505 -0.2083 -0.2318

  22. Ev18154300 Brick#53486 Checking plate 51 again The Scanback Track penetrating Cosmic !!!

  23. CC-eventBrick #: 20122Event 17926415

  24. Ev179264151 Brick#20122 23.2 GeV/c 2470 tot pe 654.7 mu pe

  25. Ev179264151 Brick#20122

  26. Ev179264151 Brick#20122 PWall4>83%

  27. RS, Wall 4, Tray 17 Cell 25 prob= 0.83 RS, Wall 5 Tray 17 Cell25 prob= 0.17 Ev179264151 Brick#20122 Kalman slopes: -0.111 0.111 Linearfit slopes: -0.109 0.105 Emu coordinates: X 4.3018 Y 8.29335

  28. Ev179264151 Brick#20122 CS scan and SB Scanning Area (40mm x32mm) and (122mm x 95.5mm) CS fog density: 6.1+-0.4 (ESS measurement) 4 hold selection Prediction angle: (-0.109, 0.105) Predicted film position: (36.3, 83.0) mm Found Track angle and position Difference from prediction angle: -0.006, -0.001 Difference from prediction positions: (17.3, -2.1) mm. Scan location  Stopping at pl 10

  29. Ev179264151 Brick#20122 X-projection NetScan data analysis

  30. Ev179264151 Brick#20122 Y-projection muon Z-projection

  31. Ev179264151 Brick#20122 Manual scan results: • 5 tracks found @ 1ry vertex 0.2181 0.1099 54505.6 78946.6 0.65 0.0492 0.0018 54396.4 78878.7 6.96 -0.1088 0.1143 54285.8 78948.9 muon track 0.4429 -0.0049 54650.5 78870.3 0.19 0.1193 -0.0594 54445.5 78861.4 22.58 !!!!!!! • Charm candidate!!! IP:22.58micron, • Electron pair found @ pl3 • One interaction (6black+some showers) have been seen near e-pair Kinematical Analysis of the event going on..

  32. Ev179264151 Brick#20122 • 1ry vertex positions: • X: 54368.4 Y: 78875.3 depth: 672.1 in the lead plate. • One track changing the slope at pl4 • at pl5 slope--> 0.4197 0.0096 57580.1 79012.7 • at pl4 slope--> 0.4297 0.0621 58107.0 79044.1 • Kink angle: 0.0534439 • e-pair at pl 3 • e-pair position: X: 55204.2 Y: 79577.4 depth: 77.5 • opening angle: 0.034141 • FL: 9686.3 micron • 1) 0.0828 0.0635 55227.2 79595.0 found at CSD • 2) 0.0947 0.0955 55229.9 79604.1 • --> scatter at pl2 • 0.1152 0.0967 55336.6 79686.2 • --> not found at pl1

  33. Ev179264151 Brick#20122 • All tracks followed down and search them at CSD, 5 out of 6 have been found. e-pair at pl3

  34. Ev179264151 Brick#20122

  35. CC-eventBrick #: 4095329Event 18224511

  36. Ev18224511 Brick#40953 x-projection

  37. Ev18224511 Brick#40953 • Vertex manually confirmed (plate 46 in lead) • 3 shower and 5 black tracks have been found. Vertex positons: X: 114205.2 Y: 94520.9 Z: 14086.8 (148micron) -0.1269 -0.1899 -- SBtrack() -0.4359 -0.0014 1.02 -0.0315 -0.0014 0.33

  38. CC-eventBrick #: 1429Event 179351351

  39. Ev17935151 Brick#1429 X-projection

  40. Ev17935151 Brick#1429 Y-projection Z-projection • 1ry tracks: • -0.1242 -0.3170 6.66 • 0.2435 0.0116 0.79 • -0.0637 -0.1381 -- muon • 1ry vertex positions: • 59665.5 21113.8 664.1

  41. NC-eventBrick #: 36564Event 17868408

  42. Ev17868408 Brick#36564 X-projection

  43. Ev17868408 Brick#36564 Y-projection Z-projection

  44. Tracks at 1ry vertex: -0.0500 0.0512 0.2196 0.0386 -0.3484 0.0436 0.0854 0.1798 0.2832 -0.2448 0.5372 -0.1691

  45. CC-eventBrick #: 33540Event 18027794 Kitagawa San will present that event..

  46. Event 180277945 CC Ev18027794 Brick#33540 Mu+ 8.7 GeV/c HPT SM1 Not working

  47. Ev18027794 Brick#33540

  48. Ev18027794 Brick#33540 Tot P.E. 1199 Muon P.E. 582 1 brick proposed: (wall,cell,tray,iside) 9 13 29 1 prob= 0.98 Muon slopes Kalman 0.0282 0.215 Muon slopes linear fit 0.0384 0.220 Extrap: 172.79364 -80.7020493 -669.255798 +- 0.482326657 0.472024381 Coordinates in emulsion frame: X 5.45781 Y 6.04764

  49. Ev18027794 Brick#33540

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