Spin asymmetries in quasielastic charged current neutrino-nucleon scattering

TL;DR

This paper investigates spin asymmetries in quasielastic charged current neutrino-nucleon scattering, highlighting their sensitivity to the nucleon's axial form factor and potential to probe nonstandard interactions.

Contribution

It provides detailed calculations of various spin asymmetries and analyzes their dependence on the axial form factor and nonstandard interactions.

Findings

Double and triple spin asymmetries depend strongly on the axial mass parameter.

Most asymmetries are sensitive to nonstandard second class current contributions.

Lepton polarization asymmetry is less sensitive to these effects.

Abstract

The work concerns the quasielastic charged current neutrino-neutron and antineutrino-proton interactions. Single, double, and triple spin asymmetries are computed and analyzed. The spin asymmetries are sensitive to the axial form factor of the nucleon. In particular, the target-recoil double spin asymmetry and the lepton-target-recoil triple spin asymmetry depend strongly on the axial form factor of the nucleon. Indeed, the sign and shape of these components depend on the axial mass parameter. All the asymmetries, except the lepton polarization, are observables well suited to study the nonstandard interactions described by the second class current contribution.