Compositeness of Hadron Resonances and Quasi-Bound States

TL;DR

This paper explores the composite structure of near-threshold hadron resonances and quasi-bound states, extending Weinberg's relation to determine their compositeness from observable data.

Contribution

It generalizes Weinberg's weak-binding relation to include near-threshold resonances and quasi-bound states, enabling their compositeness to be assessed through experimental observables.

Findings

Derived a generalized relation for near-threshold states

Provided a method to quantify hadron compositeness

Applicable to experimental data analysis

Abstract

We discuss the composite nature of hadrons appearing near the s-wave two-hadron threshold. Generalizing the Weinberg's weak-binding relation for stable bound states, we show that the compositeness of near-threshold resonances and quasi-bound states can be determined by observable quantities.