Recoil electron polarization-dependent T-odd correlations in neutrino elastic scattering on polarized electron target

Abstract

Possible symmetry breaking tests with respect to the time inversion in the elastic scattering of neutrinos on polarized electrons are considered, assuming that the incoming neutrino beam is either longitudinally or transversely polarized, and both momentum and polarization of recoil electrons are observed. In the process, in addition to the standard interaction, the exotic scalar, pseudoscalar and tensor interactions can participate. Due to the nonstandard interactions, different types of triple T-odd products in the cross section may appear. We consider several experiments in which mixed products built of the recoil electron polarization and two other vector quantities (incoming neutrino momentum, its polarization, polarization of the electron target and outgoing electron momentum) can be identified. Observations of the T-odd correlations may indicate noninvariance under time reversal as well as the presence of exotic interactions. A complete analysis of the problem requires a precise determination of the possible contributions from the interactions mimicking the genuine violation of time reversal symmetry, e.g. final state interactions.