Hyperon Spectrum in a dynamical coupled-channel approach

Abstract

In this study, we investigate the $bar{K}N$ reactions using a coupled-channels approach, covering the range of center of mass energies from the $bar{K}N$ threshold up to 2 GeV. We develop a dynamical coupled-channel model that includes the $bar{K}N$, $piSigma$, and $piLambda$ channels. Within this framework, we systematically examine the resonance and background contributions for all partial waves with J = 7/2 and achieve a strong agreement with the data. This agreement with the data allows us to perform a pole search and analyze the resonance content of strange baryons in the first and second resonance regions. Additionally, through mesonbaryon t- and u-channel exchanges, we successfully generate the two-pole structure of the sub-threshold $Lambda(1405)$, achieving good agreement with other dynamical coupled-channel models and unitarized ChPT calculations.