${\Lambda }^{\ast }$ matter and its stability

Abstract

We performed calculations of nuclear systems composed solely of ${\Lambda }^{\ast }$ hyperons, aiming at exploring the possibility of existence of absolutely stable ${\Lambda }^{\ast }$ matter. We considered ${\Lambda }^{\ast }$ interaction strengths compatible with the ${\Lambda }^{\ast }{\Lambda }^{\ast }$ binding energy $B_{{\Lambda }^{\ast }{\Lambda }^{\ast }}$ given by the $\bar{K}N$ interaction model by Yamazaki and Akaishi [1]. We found that the binding energy per ${\Lambda }^{\ast }$ saturates at values well below 100 MeV for mass number $A\ge 120$. The ${\Lambda }^{\ast }$ matter is thus highly unstable against strong interaction decay.

Comments: Proceedings of HADRON2019, 16 - 21 August 2019, Guilin, China, to appear in International Journal of Modern Physics A