Zelimir Djurcic Physics Department



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  • Zelimir Djurcic

  • Physics Department

  • Columbia University






Before MiniBooNE: The LSND Experiment











Oscillation e

  • Oscillation e

  • Example oscillation

  • signal

    • m2 = 1 eV2
    • sin22 = 0.004
  • Fit for excess as

  • function of

  • reconstructed e

  • energy



MisID 

  • MisID 

  • of these……

  • ~83% 0

    • Only ~1% of 0s are misIDed
    • Determined by clean 0 measurement
  • ~7%   decay

    • Use clean 0 measurement to estimate  production
  • ~10% other

    • Use  CCQE rate to normalize and MC for shape


e from +

  • e from +

  • Measured with  CCQE sample

    • Same parent + kinematics
  • Most important background

  • Very highly constrained (a few percent)



e from K+

  • e from K+

  • Use High energy e and  to normalize

  • Use kaon production data for shape

  • Need to subtract off misIDs



High energy e

  • High energy e

  • data

  • Events below ~2.0 GeV still in closed box (blind analysis)

















…exploits NuMI beam in a new way

  • Off-axis neutrino beams provide narrow-band kinematics

    • Reduces backgrounds
      • mis-id NC
      • e’s from K decay (wrong kinematics)
  • Increases flux at oscillation maximum.

  • This provides a good setting for e appearance experiments







NOvA coverage range for mass ordering









  • …is a compact, fully active neutrino detector designed to study neutrino-nucleus interactions with unprecedented detail

  • The detector will be placed in the NuMI beam line upstream of the MINOS Near Detector

  • MINERvA is unique in worldwide program

    • The NuMI intensity provides
    • Detector with several different nuclear targets allows 1st study of neutrino nuclear effects
    • Crucial input to current and future oscillation measurements


MINERvA proposes to build a low-risk detector with simple, well-understood technology

  • MINERvA proposes to build a low-risk detector with simple, well-understood technology

  • Active core is segmented solid scintillator

    • Tracking (including low momentum recoil protons)
    • Particle identification
    • 3 ns (RMS) per hit timing
    • (track direction, identify
    • stopped K±)
  • Core surrounded by electro-

  • magnetic and hadronic

  • calorimeters

  • MINOS Near Detector as

  • muon catcher



Reminder: proton tracks from QE events are typically short. Want sensitivity to pp~ 300 - 500 MeV

  • Reminder: proton tracks from QE events are typically short. Want sensitivity to pp~ 300 - 500 MeV

  • “Thickness” of track proportional to dE/dx in figure above

  • proton and muon tracks are clearly resolved

  • precise determination of vertex and measurement

  • of Q2 from tracking












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