Resonance $Y(4660)$ as a vector tetraquark and its strong decay channels

TL;DR

This paper models the $Y(4660)$ as a vector tetraquark and calculates its mass, couplings, and decay widths using QCD sum rules, achieving results consistent with experimental data.

Contribution

It provides a novel QCD sum rule analysis of the $Y(4660)$ as a diquark-antidiquark state, including decay channels and strong couplings.

Findings

Mass prediction $m_Y=4677^{+71}_{-63}$ MeV

Total width prediction $(64.8 \\pm 10.8)$ MeV

Decay channels consistent with experimental observations

Abstract

The spectroscopic parameters and partial widths of the strong decay channels of the vector meson $Y(4660)$ are calculated by treating it as a bound state of a diquark and antidiquark. The mass and coupling of the $J^{PC}=1^{--}$ tetraquark $Y(4660) $ are evaluated in the context of the two-point sum rule method by taking into account the quark, gluon and mixed condensates up to dimension 10. The widths of the $Y(4660)$ resonance's strong $S$-wave decays to $J/\psi f_{0}(980)$ and $\psi(2S) f_{0}(980)$ as well as to $ J/\psi f_{0}(500)$ and $\psi(2S) f_{0}(500)$ final states are computed. To this end, strong couplings in the relevant vertices are extracted from the QCD sum rule on the light cone supplemented by the technical methods of the soft approximation. The obtained result for the mass of the resonance $ m_Y=4677^{+71}_{-63}\ \mathrm{MeV}$ and the prediction for its total width $ \Gamma_{Y}= (64.8 \pm 10.8)\ \mathrm{MeV}$ is in nice agreement with the experimental information.