The Role of High Spin Hyperon Resonances in the Ξ Production Meson-Baryon Reactions

Abstract

The Chiral SU(3) lagrangian extended to next-to-leading order (NLO) in the framework of coupledchannels has been used to study the meson-baryon interaction in S-wave in the strangeness S = −1 sector. A large set of experimental data in different two-body channels has been employed to fit the low energy constants of the lagrangian, paying special attention to theKN → KΞ reaction, which is particularly sensitive to the NLO terms. The reproduction of the structures present in the cross sections of the KΞ channels, as well as their differential cross sections, has been improved by taking into account the high spin hyperonic resonances by means of a phenomenological model.