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

Abstract

In this research, we tentatively assign the Tcs(2900) as the A Ā-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 ± 0.12 GeV is in consistent with the experimental values M = 2.892 ± 0.014 ± 0.015 GeV and 2.921 ± 0.017 ± 0.020 GeV from the LHCb collaboration and supports assigning the Tcs(2900) to be the A Ā-type scalar csq 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.