Indirect limits on the CPT violating background in the neutrino sector

摘要

CPT violation in the neutrino sector, suggested as a new way to reconciledifferent neutrino anomalies, induces at the radiative level observable effectsamong charged leptons, where high-precision tests of the CPT symmetry areavailable. We show that, in the models with heavy right-handed Majorananeutrinos, constraints imposed by these experiments require CPT violation inneutrino spectrum be suppressed to a level undetectable for any conceivableneutrino experiment. We find that the CPT violation in the neutrino sector mayevade indirect constraints only at the expense of light right-handed neutrinoswith small Yukawa couplings to the Standard Model sector or by allowingnon-locality well below the electroweak scale.