Test of Lorentz and CPT violation with short baseline neutrino oscillation excesses
Abstract
The sidereal time dependence of MiniBooNE νe and νbare appearance data is analyzed to search for evidence of Lorentz and CPT violation. An unbinned Kolmogorov-Smirnov (K-S) test shows both the νe and νbare 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 νe appearance data prefer a sidereal time-independent solution, and the νbare appearance data slightly prefer a sidereal time-dependent solution. Limits of order 10-20 GeV are placed on combinations of SME coefficients. These limits give the best limits on certain SME coefficients for νμ →νe and νbarμ →νbare oscillations. The fit values and limits of combinations of SME coefficients are provided.
- Publication:
-
Physics Letters B
- Pub Date:
- January 2013
- DOI:
- 10.1016/j.physletb.2012.12.020
- arXiv:
- arXiv:1109.3480
- Bibcode:
- 2013PhLB..718.1303A
- Keywords:
-
- MiniBooNE;
- Neutrino oscillation;
- Lorentz violation;
- High Energy Physics - Experiment;
- High Energy Physics - Phenomenology
- E-Print:
- 14 pages, 3 figures, and 2 tables, submitted to Physics Letters B