arXiv:1109.3480·v3·High Energy Physics — Experiment
Test of Lorentz and CPT violation with Short Baseline Neutrino Oscillation Excesses
The MiniBooNE Collaboration: A. A. Aguilar-Arevalo🇲🇽 · C. E. Anderson🇺🇸 · A. O. Bazarko🇺🇸 · S. J. Brice🇺🇸 · B. C. Brown🇺🇸 · L. Bugel🇺🇸 · J. Cao🇺🇸 · L. Coney🇺🇸 · J. M. Conrad🇺🇸 · D. C. Cox🇺🇸 · A. Curioni🇺🇸 · R. Dharmapalan🇺🇸
Abstract
The sidereal time dependence of MiniBooNE electron neutrino and anti-electron neutrino appearance data are analyzed to search for evidence of Lorentz and CPT violation. An unbinned Kolmogorov-Smirnov test shows both the electron neutrino and anti-electron neutrino appearance data are compatible with the null sidereal variation hypothesis to more than 5%. Using an unbinned likelihood fit with a Lorentz-violating oscillation model derived from the Standard Model Extension (SME) to describe any excess events over background, we find that the electron neutrino appearance data prefer a sidereal time-independent solution, and the anti-electron neutrino appearance data slightly prefer a sidereal time-dependent solution. Limits of order 10E-20 GeV are placed on combinations of SME coefficients. These limits give the best limits on certain SME coefficients for muon neutrino to electron neutrino and anti-muon neutrino to anti-electron neutrino oscillations. The fit values and limits of combinations of SME coefficients are provided.
Comments: 14 pages, 3 figures, and 2 tables, submitted to Physics Letters B