Two-body strong decays of the hidden-charm tetraquark molecular states via the QCD sum rules

TL;DR

This paper investigates the two-body strong decays of hidden-charm tetraquark molecular states using QCD sum rules, providing decay widths that support identifying the X_2(4014) as a D*D* tetraquark molecule.

Contribution

It extends previous work on D*D* molecular states to include decay analyses via QCD sum rules, offering new insights into their decay properties and possible identification.

Findings

Calculated decay widths for ground states with J^{PC}=0^{++}, 1^{+-}, 2^{++}

Supported the assignment of X_2(4014) as a D*D* tetraquark molecule

Demonstrated the applicability of QCD sum rules to decay processes of tetraquark states

Abstract

In this work, we extend our previous work on the $D^*\bar{D}^*$ molecular states with the $J^{PC}=0^{++}$, $1^{+-}$ and $2^{++}$ to investigate their two-body strong decays via the QCD sum rules based on rigorous quark-hadron duality. We obtain the partial decay widths therefore total widths of the ground states with the $J^{PC}=0^{++}$, $1^{+-}$ and $2^{++}$, which indicate that it is reasonable to assign the $X_2(4014)$ as the $D^*\bar{D}^*$ tetraquark molecular states with the $J^{PC}=2^{++}$.