Analysis of the $T_{c\bar{s}}(2900)$ and related tetraquark states with the QCD sum rules

TL;DR

This paper uses QCD sum rules to analyze the $T_{car{s}}(2900)$ tetraquark state, predicting its mass and supporting its classification as an $Aar{A}$-type scalar tetraquark, aligning well with experimental data.

Contribution

It provides a detailed QCD sum rule analysis of the $T_{car{s}}(2900)$ and related tetraquark states, offering theoretical mass predictions that support their experimental identification.

Findings

Predicted mass of $2.92 ext{ GeV}$ matches experimental values.

Supports $T_{car{s}}(2900)$ as an $Aar{A}$-type scalar tetraquark.

Provides mass predictions for other tetraquark states for future experimental tests.

Abstract

In this research, we tentatively assign the $T_{c\bar{s}}(2900)$ as the $A\bar{A}$-type tetraquark state, and study the mass spectrum of the tetraquark states with strange and doubly strange, which have the spin-parity $J^P = 0^+$, $1^+$ and $2^+$, in the framework of the QCD sum rules in details, where the $A$ denotes the axialvector diquark state. The predicted mass $M=2.92\pm0.12\,\rm{GeV}$ is in consistent with the experimental values $M=2.892\pm0.014\pm0.015\,\rm{GeV}$ and $2.921\pm0.017\pm0.020\,\rm{GeV}$ from the LHCb collaboration and supports assigning the $T_{c\bar{s}}(2900)$ to be the $A\bar{A}$-type scalar $c\bar{s}q\bar{q}$ tetraquark state. The predictions for other tetraquark states can be confronted to the experimental data in the future to diagnose the nature of the fully open flavor exotic states.