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Non-Standard Interactions and MiniBooNE

Investigating non-standard interactions to detect neutrinos with MiniBooNE Collaboration at Kalamazoo College. Study includes Booster proton beam, Cerenkov cones, cosmic rays, and model constraints.

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Non-Standard Interactions and MiniBooNE

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  1. Non-Standard Interactions and MiniBooNE Loretta M. Johnson in collaboration with Laura Spencer and Burt DeWilde at Kalamazoo College

  2. MiniBooNE • Fermilab’s Booster proton beam • Be target in focusing horn • charged mesons DIF • primarily muon neutrinos • L ~ 500 m, E ~ 700 MeV, L/E ~ 0.8 • electron neutrino appearance

  3. timing • Cerenkov cones • cosmic rays • Michel e • neutral pions • multiple algorithm PID Photo courtesy MiniBooNE Collaboration

  4. Backgrounds • e from K and  decay •  from radiative  decay • mis-identified 0 and  Graph courtesy MiniBooNE Collaboration PRELIMINARY

  5. Backgrounds • intrinsic e ~ 0.6% from  and K decays (HARP, E910, LMC, MiniBooNE) • 0 with one photon ring unobserved (NuMI and MiniBooNE) • small  N  rate (NuMI and MiniBooNE) • studies of cosmic rays to distinguish e from 

  6. Appearance • e above background from oscillation • small L makes matter effects negligible • other possible contributions? Could part of a signal come from non-standard interactions? If no signal is seen, could new limits be put on non-standard interactions?

  7. Model • SM with three-flavor oscillations • non-standard interactions at the source modeled by:

  8. Model Constraints •  e with e detected (e) •   with e detected () •   with e detected () • tan e ~ 10-6 at most • tan  = 1 for SM • tan  ~ 10-2 at most

  9. Conclusions • with standard solar + atmo parameters, there could be a handful of e from non-standard interactions • there will be hundreds of background events • with sin2212 = 0.02 and m2 = 0.4 eV2, there could be many more events from oscillations + non-standard interactions

  10. Additional Comments • In this model, differs from the anti-process only because of phases • These phases could lead to a factor of 2/3 between LSND and MiniBooNE • Non-standard interactions do not change the L/E dependence • Near (0.15, 0.4 eV2) the two effects are comparable

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