We searched for a sidereal modulation in the rate of neutrinos observed by
the MINOS far detector. The detection of these signals could be a signature of
neutrino-antineutrino mixing due to Lorentz and CPT violation as described by
the Standard-Model Extension framework. We found no evidence for these sidereal
signals and we placed limits on the coefficients in this theory describing the
effect.Comment: Presented at the Sixth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 17-21, 201