$\bar{\nu}_{\mu}$ induced quasielastic production of hyperons leading to pions

TL;DR

This paper reviews quasielastic hyperon production by antineutrinos on nucleons and argon, analyzing cross sections, polarizations, and symmetry effects, with implications for neutrino experiments like DUNE.

Contribution

It provides a comprehensive analysis of hyperon production and polarization in antineutrino interactions, including effects of symmetries and decay contributions relevant for argon-based detectors.

Findings

Cross sections and polarization components can determine axial form factors.

Hyperon decay contributes significantly to pion production at energies ≤ 0.7 GeV.

Study aids in interpreting signals in argon-based neutrino detectors.

Abstract

The quasielastic production cross sections and polarizations of the hyperons induced by ${\bar\nu}_\mu$ on the free nucleon as well as from $^{40}$Ar in the sub-GeV energy region has been reviewed [1-5]. The effects of the second class currents in the axial vector sector with and without T-invariance as well as the effect of SU(3) symmetry breaking are also studied. We find that the cross sections and the various polarization components can effectively be used to determine the axial vector transition form factors in the strangeness sector and to test the validity of various symmetries of the weak hadronic currents like G-invariance, T-invariance and SU(3) symmetry. These hyperons decay dominantly into pions giving an additional contribution to the weak pion production induced by the antineutrinos. In the case of nuclear targets like $^{40}$Ar, this contribution is shown to be significant when compared with the pion production by the $\Delta$ excitations in the energy range of $E_{\bar{\nu}_{\mu}} \le 0.7$ GeV [1]. This study could be useful for the DUNE experiment where argon will be used as the target material and the electronic imaging of particles is possible and the particle tracks can be identified.