Production of a cascade hyperon in the K^- - proton interaction

TL;DR

This paper models the production of cascade hyperons in K^- proton interactions using an effective Lagrangian approach, highlighting the dominant role of Lambda(1520) resonances and angular distribution effects.

Contribution

It introduces a detailed effective Lagrangian model for cascade hyperon production, incorporating resonance excitations and SU(3) symmetry, with results matching experimental cross sections.

Findings

Total cross sections agree with experimental data

Lambda(1520) dominates the production process

Angular distributions show resonance interference effects

Abstract

We investigate the production of a cascade hyperon (Xi) through the K^- + p --> K^+ (K^0) + Xi^- (Xi^0) reactions, within an effective Lagrangian model where these reactions proceed via excitations of Lambda and Sigma resonance intermediate states in s- and u-channels. The coupling constants at the various vertices are taken from previous studies and SU(3) symmetry considerations. The calculated total cross sections of these reactions, which are in good agreement with the available data, are dominated by the contributions from the Lambda(1520) intermediate resonant state. However, the K^+ meson angular distributions show selectivity to other resonant states in different angular regions and interference among these states leads to their strong backward peaking.