$K^{-}d\to \pi \Sigma n$ reactions and structure of the $\Lambda (1405)$

Abstract

We report on the first results of a full three-body calculation of the $\bar{K}NN$-$\pi YN$ amplitude for the $K^{-}d\to \pi \Sigma n$ reaction, and examine how the $\Lambda (1405)$ resonance manifests itself in the neutron energy distributions of $K^{-}d\to \pi \Sigma n$ reactions. The amplitudes are computed using the $\bar{K}NN$-$\pi YN$ coupled-channels Alt-Grassberger-Sandhas (AGS) equations. Two types of models are considered for the two-body meson-baryon interactions: an energy-independent interaction and an energy-dependent one, both derived from the leading order chiral SU(3) Lagrangian. These two models have different off-shell properties that cause correspondingly different behaviors in the three-body system. As a remarkable result of this investigation, it is found that the neutron energy spectrum, reflecting the $\Lambda (1405)$ mass distribution and width, depends quite sensitively on the (energy-dependent or energy-independent) model used. Hence accurate measurements of the $\pi \Sigma$ mass distribution have the potential to discriminate between possible mechanisms at work in the formation of the $\Lambda (1405)$.

Comments: 5 pages, 4 figures, talk given at 3rd International Workshop on "State of the Art in Nuclear Cluster Physics" (SOTANCP3), held in Yokohama, Japan, May 26-30, 2014