Neutrino-antineutrino mass splitting in the Standard Model and baryogenesis

On the basis of a previously proposed mechanism of neutrino-antineutrino mass splitting in the Standard Model, which is Lorentz and SU(2) xU(1) invariant but non-local to evade the CPTtheorem, we discuss the possible implications of neutrino-antineutrino mass splitting on neutrino physics and baryogenesis. It is shown that non-locality within a distance scale of the Planck length, that may not be fatal to unitarity in a generic effective theory, can generate the neutrino-antineutrino mass splitting of the order of the observed neutrino mass differences, which is tested in oscillation experiments, and a non-negligible baryon asymmetry depending on the estimate of sphaleron dynamics. The one-loop order induced electron-positron mass splitting in the Standard Model is shown to be finite and estimated at similar to 10(-20)eV, well below the experimental bound <10(-2)eV. The induced CPT violation in the K-meson in the Standard Model is expected to be even smaller and well below the experimental bound vertical bar m(K)- m(K)vertical bar < 0.44 x10(-18)GeV. (C) 2015 The Authors. Published by Elsevier B.V.