Analysis of the strong decays of the $Y(4660)$ in tetraquark scenario via the QCD sum rules

TL;DR

This paper uses QCD sum rules to analyze the decay behaviors of vector tetraquark states as candidates for the Y(4660), finding results consistent with experimental data and supporting its tetraquark interpretation.

Contribution

It provides a detailed QCD sum rule analysis of Y(4660) as a tetraquark, including decay widths and hadronic coupling constants, offering new insights into its structure.

Findings

Predicted total decay width matches experimental data.

Supports Y(4660) as a [sc][5s5c] tetraquark with J^{PC}=1^{--}.

Calculated hadronic coupling constants for decay processes.

Abstract

Motivated by the enigmatic vector charmonium-like states, we investigate the strong decay behaviors of four kinds of vector tetraquark states, which are possible candidates for the $Y(4660)$, within the framework of three-point QCD sum rules based on rigorous quark-hadron duality. We take into account the vacuum condensates up to dimension 5 on the QCD side, and obtain the hadronic coupling constants therefore the partial decay widths of those states. The predicted total width $61.5\pm7.3\,\rm{MeV}$ is in excellent agreement with the experimental data for the $Y(4660)$, which supports its interpretation as a $[sc][\bar{s}\bar{c}]$ tetraquark state with the $J^{PC}=1^{--}$.