Investigation of the $\bar{K}$--${}^6$Li Interaction and the Search for the $\Lambda (1405)$ Resonance

Abstract

We investigate the interaction of an antikaon ($K^{-}$) with the ${}^6$Li nucleus, described as an $\alpha +d$ cluster system. The study aims to explore the formation of the $\Lambda (1405)$ resonance through the $K^{-}d$ subsystem in the presence of a spectator $\alpha$ particle. In the absence of dedicated experimental data for this reaction, particular attention is given to providing quantitative predictions for the manifestation of the $\Lambda (1405)$ structure in low-energy $\bar{K}N$ dynamics within a light nuclear environment. Employing different models of the $\bar{K}N-\pi \Sigma$ interaction, we calculate the $\pi \Sigma n$ invariant-mass spectra and the $\alpha$-particle missing-mass spectra, thereby identifying robust features of the $\Lambda (1405)$ signal and offering guidance for future experimental investigations.

Comments: 4 figures, Accepted for publication in PRC