Review ArticleNo Access

Neutral baryonic systems with strangeness

H. Garcilazo

Escuela Superior de Física y Matemáticas, Instituto Politécnico Nacional, Edificio 9, 07738 México D.F., Mexico

E-mail Address: humberto@esfm.ipn.mx

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A. Valcarce

Departamento de Física Fundamental, Universidad de Salamanca, 37008 Salamanca, Spain

E-mail Address: valcarce@usal.es

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, and

J. Vijande

Departamento de Física Atómica, Molecular y Nuclear, Universidad de Valencia (UV), and IFIC (UV-CSIC), 46100 Valencia, Spain

IRIMED Joint Research Unit (IIS La Fe - UV), 46100 Valencia, Spain

E-mail Address: javier.vijande@uv.es

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https://doi.org/10.1142/S0218301319300091Cited by:1 (Source: Crossref)

Abstract

We review the status as regards to the existence of three- and four-body bound states made of neutrons and $Λ$ 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 $Λ n n$ system has no bound states. $Λ Λ n n$ strong stable states are not favored by our current knowledge of the strangeness $- 1$ and $- 2$ baryon–baryon interactions. However, a possible $Ξ^{-} t$ quasibound state decaying to $Λ Λ n n$ might exist in nature. Similarly, there is a broad agreement about the nonexistence of $Λ Λ n$ bound states. However, the coupling to $Ξ N N$ states opens the door to a resonance above the $Λ Λ n$ threshold.

Keywords:

PACS: 21.45.-v, 25.10.+s, 11.80.Jy

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