An open charm tetraquark candidate: note on $X_{0}(2900)$

TL;DR

This paper investigates the nature of the $X_{0}(2900)$ as a possible open charm tetraquark using QCD sum rules, calculating its mass for different configurations and comparing with experimental data.

Contribution

The study applies QCD sum rules to explore the $X_{0}(2900)$ as a $udar{c}ar{s}$ tetraquark, providing mass estimates for various configurations.

Findings

Mass estimates are consistent with experimental data.

Supports $X_{0}(2900)$ as a $0^{+}$ tetraquark state.

Multiple configurations yield similar mass results.

Abstract

Motivated by the LHCb's very recent observation of exotic $X_{0}(2900)$ in the $B^{+}\rightarrow D^{+}D^{-}K^{+}$ process, for which could be a good open charm $ud\bar{c}\bar{s}$ tetraquark candidate, we endeavor to investigate its possibility by means of QCD sum rules. In technique, four configurations of interpolating currents with $J^{P}=0^{+}$ are studied for the $ud\bar{c}\bar{s}$ tetraquark state. In the end, mass values are calculated to be $2.76^{+0.16}_{-0.23}~\mbox{GeV}$ for the axial vector diquark-axial vector antidiquark configuration and $2.75^{+0.15}_{-0.24}~\mbox{GeV}$ for the scalar diquark-scalar antidiquark configuration, both of which are consistent with the experimental data $2.866\pm0.007\pm0.002~\mbox{GeV}$ of $X_{0}(2900)$ in view of the uncertainty. These results support that $X_{0}(2900)$ could be a $0^{+}$ tetraquark state with open charm flavor.