Weak production of strange Ξ baryons off the nucleon

Abstract

The charged current Cabibbo-suppressed associated KΞ production off the nucleon induced by antineutrinos is studied at low and intermediate energies. The nonresonant terms are obtained using a microscopical model based on the SU(3) chiral Lagrangian. The basic parameters of the model are fπ, the pion decay constant, Cabibbo’s angle, the proton and neutron magnetic moments, and the axial vector coupling constants for the baryons octet, D and F, that are obtained from the analysis of the semileptonic decays of neutron and hyperons. In addition, we also consider Σ∗(1385) resonance, which can decay in KΞ final state when this channel is open. The studied mechanism is the prime source of Ξ production at antineutrino energies around 2 GeV and the calculated cross sections at these energies can be measured at the current and future neutrino experiments.