Composite nature of exotic states from data analysis

Abstract

We introduce two basic concepts: the compositeness for resonance and the Castillejo-Dalitz-Dyson (CDD) pole. Applying them to hadron states $X(3872)$, $Z_b(10610)$ and $Z_b(10650)$, and $T_{cc}$, we obtain their compositeness values and achieve deeper insights into their inner structure.

Comments: 6 pages, 2 pages, Proceeding for HADRON 2025, 27 - 31 March, 2025, Osaka University, Japan