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Umut Kose

Umut Kose. Neutrino interaction location in the OPERA Experiment. Nagoya University. New Development of Flavor Physics, 10.03.2009, Tennomaru, Gamagor i. Vertex location method. CSD found. direct VTX hunting method. scan back location method. scan back. volume scan

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Umut Kose

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  1. UmutKose Neutrino interaction location in the OPERA Experiment Nagoya University New Development of Flavor Physics, 10.03.2009, Tennomaru, Gamagori

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

  3. Track is scanned around prediction point 160micron 600micron Scanback location Method CS Doublet 5 mm ECC Brick (57 emulsions + 56 Pb)‏

  4. Scanback location Method CS Doublet Stopping Plate 5 mm ECC Brick (57 emulsions + 56 Pb)‏ The vertex is confirmed by scanning a volume around the stopping position; recording all the track segments within a given angular acceptance: NetScan data taking. The fiducial volume is 1cm2x10 films in total.

  5. CS-ECC connections

  6. Direct Vertex Hunting NetScan Fiducial Volume 1cm2x10 plates ECC Brick 5 mm CS Doublet

  7. Reconstruct full vertex topology At least 2-segment connected tracks Eliminate passing through tracks Track segments overlapped How to analyse ECC data Offline tracking and vertex reconstruction

  8. VTX located 101 Stopped in ECC 158 ScanBack 200 penetrating In progress 14 57 Edge out in progress ECC arrived 3 84 368 Failed 25 VTX located 46 Direct Vertex 84 In progress 38 Summary of events: 147 neutrino interaction vertex is located in ECC bricks 147 events = 116 CC + 31 NC

  9. Position distributions • Y (mm)‏ • X(mm)‏

  10. Vertex Plate distributions • All Events • CC Events • NC Events

  11. Multiplicity distributions • All Events • CC Events • NC Events

  12. Slope distributions • qy • qx • qx • qy • Space angle

  13. nm X projection nm Y projection Z projection nm

  14. X projection Y projection Z projection

  15. Summary • In total about 500 events (Europe+Japan Scanning centers) located in ECC.. • Neutrino location chains from electronic detector to ECC working well.. • OPERA neutrino interaction location and tau decay search is going on… • The tau decay search will be introduced by the next speaker; Nonoyama…

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