Zc(4200)+ decay width as a charmonium-like tetraquark state

TL;DR

This paper investigates the decay properties of Zc(4200) to determine if it is a tetraquark state, using QCD sum rules to calculate decay widths that align with experimental data, supporting its tetraquark nature.

Contribution

The study provides the first QCD sum rule calculation of Zc(4200)'s decay widths across multiple channels, supporting its interpretation as a charmonium-like tetraquark.

Findings

Calculated decay widths match experimental data.

Supported the tetraquark interpretation of Zc(4200).

Provided decay coupling constants for multiple channels.

Abstract

To identify the nature of the newly observed charged resonance Zc(4200), we study its hadronic decays Zc(4200) -> J/psi pi, Zc(4200) -> eta_c rho and Zc(4200) -> D bar D* as a charmonium-like tetraquark state. In the framework of the QCD sum rules, we calculate the three-point functions and extract the coupling constants and decay widths for these interaction vertices. Including all these channels, the full decay width of the Zc(4200) state is consistent with the experimental value reported by the Belle Collaboration, supporting the tetraquark interpretation of this state.