Compositeness of Hadron Resonances and Quasi-Bound States

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.

Comments: 4 pages, talk given at The 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015), Sep. 7-12, 2015, Sendai, Japan