Probing the nature of Z_c states via the eta_c rho decay

TL;DR

This paper investigates the decay of Z_c states into eta_c rho to distinguish whether these particles are compact four-quark states or meson molecules, providing insights into their true nature.

Contribution

It compares the decay behavior of Z_c states under two models, offering a method to discriminate their underlying structure.

Findings

Decay patterns differ significantly between models

Potential to identify the nature of Z_c states

Provides a new approach for experimental verification

Abstract

The nature of the so-called XYZ states is a long-standing problem. It has been suggested that such particles may be described as compact four-quark states or loosely bound meson molecules. In the present work we analyze the Z_c(') -> eta_c rho decay using both approaches. Such channel might provide useful insights on the nature of the Z_c('), helping discriminating between the two different models.