Is D_s(2700) a charmed tetraquark state ?

TL;DR

This paper investigates whether the $D_s(2700)$ meson could be a tetraquark state by calculating its mass using QCD sum rules, concluding that its tetraquark component is likely very small.

Contribution

It provides a QCD sum rule calculation of the mass of a potential tetraquark component of $D_s(2700)$, offering insight into its internal structure.

Findings

Calculated mass of the tetraquark state is about 3.75 GeV.

The tetraquark component in $D_s(2700)$ is likely very small.

Mass estimate is significantly higher than experimental data.

Abstract

In this article, we take the point of view that the $D_s(2700)$ be a tetraquark state, which consists of a scalar diquark and a vector antidiquark, and calculate its mass with the QCD sum rules. The numerical result indicates that the mass of the vector charmed tetraquark state is about $M_V=(3.75\pm0.18)\rm{GeV}$ or $M_V=(3.71\pm0.15)\rm{GeV}$ from different sum rules, which is about $1\rm{GeV}$ larger than the experimental data. Such tetraquark component should be very small in the $D_s(2700)$.