Hadron Molecules

TL;DR

This paper explores the hypothesis that certain open and hidden charm mesons are hadron molecules, analyzing their decay modes and showing consistency with experimental data, thus supporting their molecular structure interpretation.

Contribution

It provides a phenomenological analysis of specific charm mesons as hadron molecules, including decay mode calculations and comparisons with experimental observations.

Findings

X(3872) decay modes align with molecular structure

Y(3940) and Y(4140) decay patterns support molecular interpretation

Strong and radiative decay analyses are consistent with experimental data

Abstract

We discuss a possible interpretation of the open charm mesons $D_{s0}^*(2317)$, $D_{s1}(2460)$ and the hidden charm mesons X(3872), Y(3940) and Y(4140) as hadron molecules. Using a phenomenological Lagrangian approach we review the strong and radiative decays of the $D_{s0}^* (2317)$ and $D_{s1}(2460)$ states. The X(3872) is assumed to consist dominantly of molecular hadronic components with an additional small admixture of a charmonium configuration. Determing the radiative ($\gamma J/\psi$ and $\gamma \psi(2s)$) and strong ($J/\psi 2\pi $ and $ J/\psi 3\pi$) decay modes we show that present experimental observation is consistent with the molecular structure assumption of the X(3872). Finally we give evidence for molecular interpretations of the Y(3940) and Y(4140) related to the observed strong decay modes $J/\psi + \omega$ or $J/\psi + \phi$, respectively.