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

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 (σ) as well as for the longitudinal, perpendicular, and transverse components of the polarization of the final baryons (p, n, Λ, Σ − , Σ 0 ) and muon produced in the quasielastic (anti)neutrino-nucleon scattering induced by the weak charged current. In the case of the production of the Λ 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 (dσ=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.

Spin asymmetries in quasielastic charged current neutrino-nucleon scattering

“…The impact of the axial contribution on the recoil nucleon and the lepton polarization is discussed in Refs. [32,32,46]. Our results confirm the conclusions of previous investigations, namely, the outgoing muon polarization, for both types of processes, weakly depends on the shape of the axial form factor.…”

“…The SCC contribution in the lepton and the recoil spin asymmetries was studied in Ref. [32]. In our analysis, we additionally consider polarized target asymmetry, three double spin asymmetries, and triple spin asymmetry.…”

“…In last several decades the SCC has been studied theoretically (for recent review see Fatima et. al [32]) and experimentally [22,[33][34][35]. However, no evidence for the SCC contribution has been obtained so far.…”

Weak production of strange Ξ baryons off the nucleon

“…For a very recent and much more detailed discussion on this issue and the impact of effects from second-class currents in some observables calculated for quasielastic neutrino (antineutrino) production of nucleons and hyperons, please see section II of Ref. [24].…”

Spin asymmetry in single pion production induced by weak interactions of neutrinos with polarized nucleons

“…The investigation of the PT in the neutrino-nucleon and the neutrino-nucleus scattering has been discussed since the 1960s [34][35][36][37][38][39][40][41][42][43][44][45][46]. Recently in [33,47], we reported the results of the discussion of the impact of the NB contribution on the PT observables.…”