Low-energy Scattering of $(D^{*}\bar{D}^{*})^\pm$ System and the Resonance-like Structure $Z_c(4025)$

TL;DR

This study uses lattice QCD to analyze low-energy scattering of $D^{*}ar{D}^{*}$ mesons, revealing weak repulsion and no shallow bound state, offering insights into the nature of the $Z_c(4025)$ resonance-like structure.

Contribution

First lattice QCD calculation of $D^{*}ar{D}^{*}$ scattering parameters at multiple pion masses in the $J^P=1^+$ channel.

Findings

Interaction is weakly repulsive in the studied channel.

No evidence of a shallow bound state for the meson pair.

Provides insights into the nature of $Z_c(4025)$ resonance.

Abstract

In this paper, low-energy scattering of the $(D^{*}\bar{D}^{*})^\pm$ meson system is studied within L\"uscher's finite-size formalism using $N_{f}=2$ twisted mass gauge field configurations. With three different pion mass values, the $s$-wave threshold scattering parameters, namely the scattering length $a_0$ and the effective range $r_0$, are extracted in $J^P=1^+$ channel. Our results indicate that, in this particular channel, the interaction between the two vector charmed mesons is weakly repulsive in nature hence do not support the possibility of a shallow bound state for the two mesons, at least for the pion mass values being studied. This study provides some useful information on the nature of the newly discovered resonance-like structure $Z_c(4025)$ observed in various experiments.