Range correction in the weak-binding relation for unstable states

Abstract

The compositeness is defined as the weight of the hadronic molecule in the hadron wave function. We can determine the internal structure of the weak-binding system without any specific models from the compositeness. In order to estimate the compositeness of the system with a large effective range, we introduce the range correction to Weinberg's weak-binding relation by modifying the correction terms. We study the applicability of the weak-binding relations by the numerical calculation and show that the improved relation can be applied to a larger parameter region compared with the previous one.

Comments: 5 pages, 2 figures, Proceedings of Particles and Nuclei International Conference (PANIC2021), 5-10 September 2021