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Andy Blake Cambridge University Wednesday June 13 th 2007

Combined Atmospheric Analysis: Study of 6 Month’s Data. Andy Blake Cambridge University Wednesday June 13 th 2007. Overview. Developing a combined atmospheric neutrino analysis: – Contained vertex muon neutrinos (John Chapman). – Upward-going muons (Brian Rebel, John Chapman).

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Andy Blake Cambridge University Wednesday June 13 th 2007

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  1. Combined Atmospheric Analysis: Study of 6 Month’s Data. Andy Blake Cambridge University Wednesday June 13th 2007

  2. Overview • Developing a combined atmospheric neutrino analysis: • – Contained vertex muon neutrinos (John Chapman). • – Upward-going muons (Brian Rebel, John Chapman). • – Contained vertex electron neutrinos (Ben Speakman). • Currently developing event selection code: • – All track and shower selection variables now calculated • in AtNuOutput classes and stored in AtNuEvent classes. • – Event selection implemented in AtNuAna package. • – Analysis variables written to short AtNuAna Ntuples. • Have now completed study using six month data sample. Andy Blake, Cambridge University Combined Analysis, slide 2

  3. Event Selection Outline of event selection: DATA / MC Data: HV, coil, GPS, LI, bad chips etc. MC: large scatters. DATA QUALITY CHECKS LI rejection, clean planes, “fiducial” event GOOD EVENTS John and Brian’s track selection Ben’s shower selection GOOD TRACKS GOOD SHOWERS UPWARD-GOING MUONS CONTAINED VERTEX ELECTRON NEUTRINOS Andy Blake, Cambridge University Combined Analysis, slide 3

  4. Event Types typedef enum EEventType { kNothing = 0x00, kGoodSlice = 0x01, kGoodEvent = 0x02, kGoodTrack = 0x04, kGoodShower = 0x08, kCV = 0x10, kCE = 0x20, kUP = 0x40, kFC = 0x80, kPC = 0x100, kPCDN = 0x200, kPCUP = 0x400, kUPMU = 0x800, kCosmic = 0x1000, kStoppingMuon = 0x2000, kThroughGoingMuon = 0x4000, kMultipleMuon = 0x8000, kVeto = 0x10000, kSpill = 0x20000, kBeamSpill = 0x40000, kFakeSpill = 0x80000, kGoodDirection = 0x100000, kGoodCharge = 0x200000, kPositiveCharge = 0x400000, kNegativeCharge = 0x800000, kAtmosNumu = 0x1000000, kAtmosNumuCV = 0x2000000, kAtmosNumuUP = 0x4000000, kAtmosNue = 0x8000000, kLIevent = 0x10000000, kMCscatter = 0x20000000 } EventType_t; typedef enum EAtmosEventType { kNothing = 0x00, kGoodEvent = 0x01, kSpill = 0x02, kBeamSpill = 0x04, kVeto = 0x08, kCV = 0x10, kUP = 0x20, kGoodTrack = 0x40, kGoodShower = 0x80, kAtmosNumu = 0x100, kAtmosNumuCV = 0x200, kAtmosNumuUP = 0x400, kAtmosNue = 0x800, kAtmosNumuCVcut1 = 0x1000, kAtmosNumuCVcut2 = 0x2000, kAtmosNumuCVcut3 = 0x4000, kAtmosNumuCVcut4 = 0x8000, kAtmosNumuUPcut1 = 0x10000, kAtmosNumuUPcut2 = 0x20000, kAtmosNumuUPcut3 = 0x40000, kAtmosNumuUPcut4 = 0x80000, kAtmosNueCVcut1 = 0x100000, kAtmosNueCVcut2 = 0x200000, kAtmosNueCVcut3 = 0x400000, kAtmosNueCVcut4 = 0x800000 } AtmosEventType_t; containment Atmospheric Neutrino Event Types containment cuts cosmics Event Types veto shield, beam spills upward going cuts good direction, good charge electron neutrino cuts Above event types defined by methods in AtNuAna class. light injection MC scatter Andy Blake, Cambridge University Combined Analysis, slide 4

  5. 6 Month Study • Data. • – runs 31812/0-33480/6. • (Jun 1st 2005 - Dec 31st 2005). • – 206 days live time. • Atmospheric Neutrino MC. • – runs 233-242 (Cambridge). • – 10x 178.3 kT-Yrs. • Upward Muon MC. • – runs 900-999 (Brian). • – 100x 2 yrs . • Cosmic Muon MC. • – runs 651-750 (Cambridge). • – 100x 17 hrs (70 days) . Andy Blake, Cambridge University Combined Analysis, slide 5

  6. Data Quality Checks Good Data Bad Data Andy Blake, Cambridge University Combined Analysis, slide 6

  7. Data Quality Checks BAD HV Integrated Live Time BAD COIL 100% line Andy Blake, Cambridge University Combined Analysis, slide 7

  8. Data/MC Checks Stopping Muons: Reconstructed Zenith Angle Andy Blake, Cambridge University Combined Analysis, slide 8

  9. Data/MC Checks Stopping Muons: RMS of Down-Going Timing Fit Timing fitting code under further study Andy Blake, Cambridge University Combined Analysis, slide 9

  10. Data/MC Checks Stopping Muons: Track Fit Relative Error Andy Blake, Cambridge University Combined Analysis, slide 10

  11. Reconstruction Checks Selected Contained Atmospheric Muon Neutrinos: Reconstructed Muon Momentum From Range. Andy Blake, Cambridge University Combined Analysis, slide 11

  12. Reconstruction Checks Selected Contained Atmospheric Muon Neutrinos: Reconstructed Muon Momentum From Curvature. Andy Blake, Cambridge University Combined Analysis, slide 12

  13. Reconstruction Checks Selected Contained Atmospheric Muon Neutrinos: Reconstructed Hadronic Shower Energy. Andy Blake, Cambridge University Combined Analysis, slide 13

  14. Contained Event Selection • Good Event Selection • – Data Quality Cuts. • Good Track Selection. • – Track Planes. • – Track Like Planes. • – Track Pulse Height Fraction. • – “Fiducial” Track. • Containment Cuts. • – Contained Vertex. • – Trace Cut. • – Topology Cuts (I). • – Topology Cuts (II). • – Veto Shield Cut. John C’s Selection Cuts Andy Blake, Cambridge University Combined Analysis, slide 14

  15. Trace Cut Contained Event Selection: Trace cut Andy Blake, Cambridge University Combined Analysis, slide 15

  16. Topology Cuts (I) Contained Event Selection: Mean/RMS position of strips around vertex Andy Blake, Cambridge University Combined Analysis, slide 16

  17. Topology Cuts (I) Contained Event Selection: Maximum plane charge, Strip displacement at vertex Andy Blake, Cambridge University Combined Analysis, slide 17

  18. Topology Cuts (II) Contained Event Selection: Vertex Charge vs Track Direction Region removed by selection cut Andy Blake, Cambridge University Combined Analysis, slide 18

  19. Veto Shield Cut Time of Closest Veto Shield Hit (Cut at ±50 ns) Andy Blake, Cambridge University Combined Analysis, slide 19

  20. Results Contained Event Selection expectation = 86 ± 12 events (no oscillations) Andy Blake, Cambridge University Combined Analysis, slide 20

  21. Up-Going Event Selection • Good Event Selection. • – Data Quality Cuts. • Good Track Selection. • – Track Planes. • – Track Like Planes. • – Track Pulse Height Fraction. • – “Fiducial” Track. • Up Going Cuts. • – Topology Cuts. • – Timing Cuts (I). • – Timing Cuts (II). John C’s Selection Cuts Andy Blake, Cambridge University Combined Analysis, slide 21

  22. Timing Cuts (I) Upward Event Selection: RMS timing deviations (up going, down going timing fits) Andy Blake, Cambridge University Combined Analysis, slide 22

  23. Timing Cuts (I) Upward Event Selection: RMS(up) / Range cut Andy Blake, Cambridge University Combined Analysis, slide 23

  24. Timing Cuts (I) Upward Event Selection: time slope cut Andy Blake, Cambridge University Combined Analysis, slide 24

  25. Timing Cuts (II) Upward Event Selection: RMS(up)-RMS(down) Andy Blake, Cambridge University Combined Analysis, slide 25

  26. Results Upward Event Selection expectation = 69 ± 10 events (no oscillations) Andy Blake, Cambridge University Combined Analysis, slide 26

  27. Electron Neutrino Selection • Good Event Selection. • – Data Quality Cuts. • Good Shower Selection. • – Clean Planes. • – Shower Planes. • – Shower Pulse Height Fraction. • – “Fiducial” Shower. • Up Going Cuts. • – Contained Vertex. • – Shower Trace. • – Mean/RMS strips/charge per plane. • – Moment of Inertia Tensor. Ben’s Selection Cuts Andy Blake, Cambridge University Combined Analysis, slide 27

  28. Shower Trace Cut Electron Neutrino Selection: Shower Trace. SHORT SHOWERS LONG SHOWERS Andy Blake, Cambridge University Combined Analysis, slide 28

  29. Topology Cuts Electron Neutrino Selection: RMS Strips Per Plane. SHORT SHOWERS LONG SHOWERS Andy Blake, Cambridge University Combined Analysis, slide 29

  30. MOI Cuts Electron Neutrino Selection: Moment of Inertia Tensor. SHORT SHOWERS LONG SHOWERS Andy Blake, Cambridge University Combined Analysis, slide 30

  31. Veto Shield Cut Time of Closest Veto Shield Hit (Cut at ±50 ns) Andy Blake, Cambridge University Combined Analysis, slide 31

  32. Results Electron Neutrino Selection expectation = 40 ± 5 events (no oscillations) Andy Blake, Cambridge University Combined Analysis, slide 32

  33. Summary Muon Neutrino Selection Electron Neutrino Selection Andy Blake, Cambridge University Combined Analysis, slide 33

  34. Selected FC/PC Events Selected FC/PC Events: Vertex Distance from Edge of Detector Andy Blake, Cambridge University Combined Analysis, slide 34

  35. Selected FC/PC Events Selected FC/PC Events: Reconstructed Neutrino Energy Andy Blake, Cambridge University Combined Analysis, slide 35

  36. Selected FC/PC Events Selected FC/PC Events: Reconstructed L/E Andy Blake, Cambridge University Combined Analysis, slide 36

  37. Vetoed FC/PC Events Vetoed FC/PC Events: Vertex Distance from Edge of Detector Andy Blake, Cambridge University Combined Analysis, slide 37

  38. Vetoed FC/PC Events Vetoed FC/PC Events: Reconstructed Zenith Angle (from top of track) Andy Blake, Cambridge University Combined Analysis, slide 38

  39. Vetoed FC/PC Events Vetoed FC/PC Events: Track Planes. Andy Blake, Cambridge University Combined Analysis, slide 39

  40. Selected UPMU Events Selected UPMU Events: Reconstructed Muon Momentum Andy Blake, Cambridge University Combined Analysis, slide 40

  41. Selected UPMU Events Selected UPMU Events: Reconstructed Zenith Angle Need to add the horizontal events Andy Blake, Cambridge University Combined Analysis, slide 41

  42. Selected NUE Events Selected NUE Events: Vertex Distance from Edge of Detctor Andy Blake, Cambridge University Combined Analysis, slide 42

  43. Selected NUE Events Selected NUE Events: Shower Planes Andy Blake, Cambridge University Combined Analysis, slide 43

  44. Selected NUE Events Selected NUE Events: Reconstructed Shower Energy. Reconstructed using hadronic energy scale, So needs re-tuning Andy Blake, Cambridge University Combined Analysis, slide 44

  45. Vetoed NUE Events Vetoed NUE Events: Vertex Distance from Edge of Detector Andy Blake, Cambridge University Combined Analysis, slide 45

  46. Vetoed NUE Events Vetoed NUE Events: Reconstructed Shower Energy Large disagreement between data and MC Andy Blake, Cambridge University Combined Analysis, slide 46

  47. Summary • Much of Analysis Implemented. • – Data Quality Checks. • – Data/MC Comparisons. • – MC Checks. • – Event Selection. • Some disagreements. • – Timing Simulation. • – Shower Energy Reconstruction. • – Electron Neutrino Background. • Future Work. • – Timing Calibration for Latest Data. • – Study Veto Shield. • – Bayesian L/E Resolution. Andy Blake, Cambridge University Combined Analysis, slide 47

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