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Neutrino mass resolution study. Study Neutrino mass reconstruction in MC Study semi-leptonic B decays Recent reskim Use MC truth to identify B decay products Use (Ghit) MC matching to study reconstruction effects Identify which effects have the most impact on neutrino mass resolution

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neutrino mass resolution study
Neutrino mass resolution study
  • Study Neutrino mass reconstruction in MC
    • Study semi-leptonic B decays
      • Recent reskim
    • Use MC truth to identify B decay products
    • Use (Ghit) MC matching to study reconstruction effects
      • Identify which effects have the most impact on neutrino mass resolution
    • Use Mini information to improve reconstruction
      • Work through effects in order of importance
    • Define event selection to remove ‘unrecoverable’ data
  • Status
    • Tooling-up mostly complete
      • Gutils package
      • Gtrack bugs identified and fixed or worked-around
    • Preliminary plots (without Reco matching)

David Nathan Brown 1 Semi-leptonic recoil group 5 August, 2004

slide2
60% of skimmed generic B0 MC have a semi-leptonic B decay
  • Use GTrack (MC truth) P4
  • Follow B decay to the first (prompt) long-lived particles
  • Neutrino mass2 computed as B P4 - S long-lived P4

David Nathan Brown 2 Semi-leptonic recoil group 5 August, 2004

slide3
Prompt = not a decay product of a long-lived particle
  • Observable = long-lived - neutrinos
  • Measurable = Observable - neutral hadrons
  • Detectable = Measurable with crude detector acceptance

David Nathan Brown 3 Semi-leptonic recoil group 5 August, 2004

next step study reco effects
Next Step - study reco effects
  • Multiply-counted objects
    • loopers
    • ghosts
    • decays (mother + daughter)
    • split track-Emc
    • Material interactions (mother + daughters)
  • Lost particles
    • acceptance
    • Below momentum threshold
    • Material interaction
  • Resolution
    • Gaussian
    • Non-gaussian
      • merged decays
      • pat rec errors
      • inverted track direction
      • wrong decay point (for V0s)
  • Background
    • machine background tracks and clusters
  • PID error (wrong track mass)

David Nathan Brown 4 Semi-leptonic recoil group 5 August, 2004

reconstruction improvements
Reconstruction Improvements
  • Tracking
    • Add Svt dE/dx as a momentum constraint on svt-only tracks
    • Add beamspot as a point on low-momentum tracks
    • Look for lost svt-only tracks using beamspot + 2 hits
    • Remove hits with bad timing or fit consistency using final Kalman fit
    • Merge (or eliminate) loopers and ghosts using full Kalman fit
    • Use track fit hypo chisq differences as a ‘last-resort’ PID
  • Neutrals
    • Associate multiple (splitoff) bumps to a single hadronic track
    • Identify events with neutral hadrons using Ifr + Emc information
  • Other
    • Use material map to improve Brem correction
    • Reconstruct nuclear interactions
    • Reconstruct single-photon gamma conversions

David Nathan Brown 5 Semi-leptonic recoil group 5 August, 2004