Is $J^{PC}=3^{-+}$ molecule possible?

TL;DR

This paper investigates the theoretical possibility of a $J^{PC}=3^{-+}$ heavy quark molecule using a one-boson-exchange model, suggesting such a state could exist under certain conditions and might be observed near the $D^*ar{D}_2^*$ threshold.

Contribution

It introduces a detailed analysis of the potential existence of a $J^{PC}=3^{-+}$ heavy quark molecule using a one-boson-exchange model, highlighting conditions for its formation.

Findings

Strong attraction in $J=3$, $I=0$ channel for $ ext{pi}$ and $ ext{sigma}$ exchanges.

Possible bound state with a cutoff around 2.3 GeV under certain form factors.

Observation of a state near 4472 MeV could imply a $3^{-+}$ molecule, not a conventional meson.

Abstract

The confirmation of charged charmonium-like states indiates that heavy quark molecules should exist. We here discuss the possibility of a molecule state with $J^{PC}=3^{-+}$. In a one-boson-exchange model investigation for the S wave $C=+$ $D^*\bar{D}_2^*$ states, one finds that the strongest attraction is in the case $J=3$ and $I=0$ for both $\pi$ and $\sigma$ exchanges. Numerical analysis indicates that this hadronic bound state might exist if a phenomenological cutoff parameter around 2.3 GeV (1.5 GeV) is reasonable with a dipole (monopole) type form factor in the one-pion-exchange model. The cutoff for binding solutions may be reduced to a smaller value once the $\sigma$ exchange contribution is included. If a state around the $D^*\bar{D}_2^*$ threshold ($\approx$4472 MeV) in the channel $J/\psi\omega$ (P wave) is observed, the heavy quark spin symmetry implies that it is not a $c\bar{c}$ meson and the $J^{PC}$ are likely to be $3^{-+}$.