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Enhancing Neutral Current Sensitivity: Insights from the MINOS Collaboration

This presentation by Philip Rodrigues explores avenues to improve sterile sensitivity in neutrino experiments, specifically focusing on neutral current (NC) interactions. Key discussions include factors influencing sensitivity, optimal resolution for energy measurements, and the impact of various event selection strategies. The analysis includes high-statistics fake data to refine the sterile model, investigates the PID methods for selecting NC events, and concludes that while improvements in sensitivity are theoretically possible, practical implementations remain challenging.

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Enhancing Neutral Current Sensitivity: Insights from the MINOS Collaboration

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Presentation Transcript

  1. Possible directions for NC sensitivity Philip Rodrigues April 2008 Minos collaboration meeting, Sussex

  2. Introduction • How might we improve sterile sensitivity? • More generally, what affects our sensitivity? • Investigate by fitting fsterile model with high-stats fake data • Ease of interpretation – can add other models later • Δm2=2.38, sin22θ=1, fs=0, high stats fake data scaled to 2.5e20 pot • TO selection, 1 NC and 1 CC spectrum unless stated • Caveat: Only statistical sensitivity.

  3. Energy measures • Optimal shower energy resolution (0%!) • True neutrino energy!! Worse! Because Eshw!=nuEnergyNC • NC events smeared by y*shwRes – this says latter is small (relatively) • Not just a counting experiment

  4. PID • “Magic” PID that selects NC with e=p=1 • Improves CC too, since no BG there • Improvements possible in principle. • In practice, probably not

  5. y Distribution • Split NC sample at y=0.5,0.7 • Not so useful – this splits the CC background in the same way • Wouldn’t happen for a real y-dependent variable

  6. Conclusions • No obvious easy way to improve sensitivity yet

  7. Bonus slide • Energy correction function for Eshw: • Used in CC. Is it useful for NC? • CC: Enu=Emu+Eshw • Enu resolution degrades if (reco Eshw – true Eshw) is fn of Eshw • NC: Just Eshw, so true→reco matrix takes care of it

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