Speaker
Description
Recent experiments have discovered various exotic hadrons near scattering thresholds, stimulating interest in their internal structure. The compositeness is a useful quantity to characterize the hadronic molecular component of eigenstates [1]. In this work, we discuss the compositeness of near-threshold exotic hadrons, especially in the charm sector. We first consider the universal behavior of shallow $s$-wave bound states and apply the framework to near-threshold candidates such as $X(3872)$ and $T_{cc}$ [2]. We then extend the discussion to a near-threshold $p$-wave resonance, focusing on the exotic-hadron candidate $G(3900)$, for which the relation between the pole position and the internal structure is qualitatively different from the $s$-wave bound-state case [3].
[1] T. Kinugawa and T. Hyodo, Eur. Phys. J. A 61, 154 (2025).
[2] T. Kinugawa and T. Hyodo, Phys. Rev. C 109, 045205 (2024).
[3] T. Kinugawa, S. Ampuku, K. Miyake, and M. Oka, in preparation.
