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