$D_sD^*$ molecule as an axial meson

TL;DR

This paper investigates the possible existence of a $D_sar{D}^*+ D_s^*ar{D}$ molecular state with quantum number $J^P=1^+$ using QCD sum rules, estimating its mass around 3.96 GeV.

Contribution

It introduces a QCD sum rule analysis for a specific $D_sD^*$ molecule, considering condensates up to dimension eight and leading order in $eta_s$, providing a mass estimate.

Findings

Mass of the $D_sD^*$ molecule estimated at 3.96 GeV

Proposed state is a natural extension of the X(3872) in the strangeness sector

Results are consistent with a multiquark state hypothesis

Abstract

We use QCD sum rules to study the possible existence of a $D_s\bar{D}^*+ D_s^*\bar{D}$ molecule with the quantum number $J^P=1^+$. We consider the contributions of condensates up to dimension eight and work at leading order in $\alpha_s$. We obtain $m_{D_sD^*}=(3.96\pm0.10) \GeV$ around 100 MeV above the mass of the meson X(3872). The proposed state is a natural generalized state to the strangeness sector of the X(3872), which was also found to be consistent with a multiquark state from a previous QCD sum rule analysis.