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

TL;DR

This paper explores how T-odd correlations in neutrino-electron elastic scattering with polarized targets can reveal potential time-reversal symmetry violations and exotic interactions beyond the Standard Model.

Contribution

It introduces a framework for detecting T-odd correlations involving recoil electron polarization and exotic interactions in neutrino scattering experiments.

Findings

Identification of T-odd products involving recoil electron polarization and other vectors.

Proposals for experiments to observe T-odd correlations indicating symmetry violation.

Analysis of how exotic scalar, pseudoscalar, and tensor interactions can contribute.

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.