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Structure of near-threshold quasi-bound states | | Yuki Kamiya
; Tetsuo Hyodo
; | | Date: |
1 Sep 2015 | | 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. | | Source: | arXiv, 1509.0146 | | Services: | Forum | Review | PDF | Favorites | |
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