Second class currents and T violation in quasielastic neutrino and antineutrino scattering from nucleons

TL;DR

This paper investigates second class currents and T violation effects in quasielastic neutrino and antineutrino scattering from nucleons, analyzing polarization and cross sections to test weak current symmetries.

Contribution

It provides detailed numerical analysis of polarization observables and cross sections considering second class currents and T violation in neutrino-induced quasielastic scattering.

Findings

Polarization measurements can test weak current symmetries.

Q^2 dependence of polarization helps determine transition form factors.

Results suggest polarization observables are sensitive to second class currents.

Abstract

The effect of the second class currents with and without time reversal invariance has been studied in the quasielastic production of nucleons and hyperons induced by neutrinos and antineutrinos from the nucleons. The numerical results are presented for the total scattering cross section~($\sigma$) as well as for the longitudinal, perpendicular and transverse components of the polarization of the final baryons ($p$, $n$, $\Lambda$, $\Sigma^-$, $\Sigma^0$) and muon produced in the quasielastic (anti)neutrino-nucleon scattering induced by the weak charged current. In the case of the production of $\Lambda$ hyperon, which is the most suitable candidate for making the polarization measurements, we have also calculated the $Q^2$ dependence of the polarization observables and the differential scattering cross section ($d\sigma/dQ^2$). The measurement of the polarization observables and their $Q^2$ dependence provides an independent way to determine the nucleon-hyperon transition form factors at high $Q^2$ which can provide tests of the symmetries of the weak hadronic currents like G-invariance, T invariance and SU(3) symmetry.