Search for Lorentz and CPT violation using sidereal time dependence of neutrino flavor transitions over a short baseline

Ariga, Akitaka; Ereditato, Antonio; Hierholzer, Martin; Nirkko, Martti; Pistillo, Ciro; Redij, Asmita Ajit; Wilkinson, Callum (2017). Search for Lorentz and CPT violation using sidereal time dependence of neutrino flavor transitions over a short baseline. Physical review. D - particles, fields, gravitation, and cosmology, 95(11) American Physical Society 10.1103/PhysRevD.95.111101

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A class of extensions of the Standard Model allows Lorentz and CPT violations, which can be
identified by the observation of sidereal modulations in the neutrino interaction rate. A search for such modulations was performed using the T2K on-axis near detector. Two complementary methods were used in this study, both of which resulted in no evidence of a signal. Limits on associated Lorentz and CPT violating terms from the Standard Model Extension have been derived taking into account their correlations in this model for the first time. These results imply such symmetry violations are suppressed by a factor of more than 10²⁰ at the GeV scale.

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