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Non-Standard Interactions and MiniBooNE

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

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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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