Could $Z_{c}(4025)$ be a $J^{P}=1^{+}$ $D^{*}\bar{D^{*}}$ molecular state?

TL;DR

This paper uses QCD sum rules to explore if the $Z_{c}(4025)$ resonance can be a $D^{*}\bar{D}^{*}$ molecular state with $J^{P}=1^{+}$, finding a compatible mass estimate.

Contribution

It provides a QCD sum rule analysis supporting the possibility that $Z_{c}(4025)$ is a $D^{*}\bar{D}^{*}$ molecular state with specific quantum numbers.

Findings

Mass estimate of $(4.05\pm 0.28)$ GeV for the state.

Supports $Z_{c}(4025)$ as a $D^{*}\bar{D}^{*}$ molecular candidate.

Uses operator product expansion up to dimension six.

Abstract

We investigate whether the newly observed narrow resonance $Z_{c}(4025)$ can be described as a $D^{*}\bar{D^{*}}$ molecular state with quantum numbers $J^{P}=1^{+}$. Using QCD sum rules, we consider contributions up to dimension six in the operator product expansion and work at leading order of $\alpha_{s}$. The mass obtained for this state is $(4.05\pm 0.28) \mbox{GeV}$. It is concluded that $D^{*}\bar{D^{*}}$ molecular state is a possible candidate for $Z_{c}(4025)$.