Dimesonic states with the heavy-light flavour mesons

TL;DR

This paper calculates the mass spectra and decay properties of dimesonic states involving heavy-light mesons, comparing theoretical predictions with experimental data to explore their molecular structure and suggest potential bound states for future experimental verification.

Contribution

The study introduces a variational scheme with Hellmann and One Pion Exchange potentials to analyze dimesonic states, providing new insights into their mass spectra and decay properties, especially for states like X(3872).

Findings

X(3872) decay ratios suggest it is not a pure molecular state.

Predicted mass spectra for various dimesonic states.

Close to molecular structure or dominant molecular component indicated.

Abstract

In this work, we have calculated the mass spectra and decay properties of dimesonic states in the variational scheme. The inter-mesonic interaction considered as the Hellmann potential and One Pion Exchange potential. The mass spectra of the $D\overline{D^{*}}$, $D^{*}\overline{D^{*}}$, $D\overline{B^{*}}$, $B^{*}\overline{D}$, $B\overline{B^{*}}$, $B^{*}\overline{B^{*}}$ bound states are calculated. The states X(3872), $X_{2c}(4013)$, $Z_{b}(10610)/X_{b}$ and $Z_{b}(10650)/X_{b2}$ are compared with $D\overline{D^{*}}$, $D^{*}\overline{D^{*}}$, $B\overline{B^{*}}$ and $B^{*}\overline{B^{*}}$ dimesonic bound states. {\bf To probe the molecular structure of the compared states, we have calculated the decay properties sensitive to their long and short distance structure of the hadronic molecule. The radiative decay for the state X(3872) into $J/\psi \gamma$ and $\psi(2S) \gamma$ have been calculated and the ratio is found to be ten times lesser than the experimental value whereas the other decay modes are comparable with other theoretical and experimental results. This results restrict us to assigned the pure molecular structure to the X(3872). But, Our results suggests that the compared states are close to the molecular structure or have dominant molecular component in their wave function. Apart from these, the other calculated mass spectra of dimesonic states are predicted and for such bound states, the experimental search are suggested.}