Neutral baryonic systems with strangeness

Abstract

We review the status as regards to the existence of three- and four-body bound states made of neutrons and [Formula: see text] hyperons. For interesting cases, the coupling to neutral baryonic systems made of charged particles of different strangeness has been addressed. There are strong arguments showing that the [Formula: see text] system has no bound states. [Formula: see text] strong stable states are not favored by our current knowledge of the strangeness [Formula: see text] and [Formula: see text] baryon–baryon interactions. However, a possible [Formula: see text] quasibound state decaying to [Formula: see text] might exist in nature. Similarly, there is a broad agreement about the nonexistence of [Formula: see text] bound states. However, the coupling to [Formula: see text] states opens the door to a resonance above the [Formula: see text] threshold.