On Gamov states of $\Sigma^+$ hyperons

TL;DR

This paper discusses the formation of Gamov states of $\Sigma^+ ext{ hyperons}$ in nuclear capture reactions, explaining experimental observations and their implications for hyperon-nucleus interactions.

Contribution

It provides a theoretical description of Gamov states of $\Sigma^+ ext{ hyperons}$ and explores their role in nuclear capture processes, linking experimental data to state formation.

Findings

Evidence of low $\Sigma^+ ext{ momentum component}$ linked to Gamov states

Interpretation of experimental data as hyperons trapped in Coulomb fields

Implications for hyperon-nucleus interaction models

Abstract

Both the FINUDA and AMADEUS experiments evidenced a low $\Sigma^+$ momentum component when investigating $\Sigma^+ \pi^-$ pairs produced in K$^-$ nuclear capture. This component is interpreted as a consequence of Gamov state formation, with the hyperon trapped in the Coulomb field of the residual nucleus. Description of such states and their participation in the capture reaction is presented. Some consequences are indicated.