Search for Lorentz Invariance and $CPT$ Violation with the MINOS Far Detector

Search for Lorentz Invariance and $C P T$ Violation with the MINOS Far Detector

P. Adamson et al. (MINOS Collaboration)

Phys. Rev. Lett. 105, 151601 – Published 4 October 2010

Abstract

We searched for a sidereal modulation in the MINOS far detector neutrino rate. Such a signal would be a consequence of Lorentz and $C P T$ violation as described by the standard-model extension framework. It also would be the first detection of a perturbative effect to conventional neutrino mass oscillations. We found no evidence for this sidereal signature, and the upper limits placed on the magnitudes of the Lorentz and $C P T$ violating coefficients describing the theory are an improvement by factors of 20–510 over the current best limits found by using the MINOS near detector.