Structure of near-threshold quasi-bound states
Abstract
We study the compositeness of near-threshold quasi-bound states in the framework of effective field theory. From the viewpoint of the low-energy universality, we revisit the model-independent relations between the structure of the bound state and the observables in the weak binding limit. The effective field theory is utilized to generalize the weak-binding relation of the stable bound states to unstable quasi-bound states with decay modes. We present the interpretation of the complex values of the compositeness for the unstable states. Combining the model-independent relation and the threshold observables extracted from the experimental data, we show that Lambda(1405) is dominated by the Kbar N molecular structure and that a_0(980) is dominated by the non-Kbar K component.
Keywords
Cite
@article{arxiv.1509.00146,
title = {Structure of near-threshold quasi-bound states},
author = {Yuki Kamiya and Tetsuo Hyodo},
journal= {arXiv preprint arXiv:1509.00146},
year = {2016}
}
Comments
5 pages, no figure, v3: published version