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

TL;DR

This study performs a comprehensive three-body calculation of the $K^-d ightarrow \pi\Sigma n$ reaction to analyze how the $\Lambda(1405)$ resonance appears in neutron energy distributions, revealing model-dependent sensitivities.

Contribution

It introduces a full three-body calculation using coupled-channels AGS equations with two different meson-baryon interaction models to study the $\Lambda(1405)$ resonance.

Findings

Neutron energy spectrum depends strongly on the interaction model used.

Accurate $\pi\Sigma$ mass distribution measurements can distinguish formation mechanisms of $\Lambda(1405)$.

The resonance's manifestation varies with off-shell properties of the interaction models.

Abstract

We report on the first results of a full three-body calculation of the $\bar{K}NN$-$\pi YN$ amplitude for the $K^-d\rightarrow\pi\Sigma n$ reaction, and examine how the $\Lambda(1405)$ resonance manifests itself in the neutron energy distributions of $K^-d\rightarrow\pi\Sigma n$ 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 $\Lambda(1405)$.