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 $T_{c\bar{s}}(2900)$ 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 $M=2.92\pm 0.12\mathrm{GeV}$ is in consistent with the experimental values $M=2.892\pm 0.014\pm 0.015\mathrm{GeV}$ and $2.921\pm 0.017\pm 0.020\mathrm{GeV}$ 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.

20 pages, 7 figures

References in corpus (3)

• Analysis of the hidden-bottom tetraquark mass spectrum with the QCD sum rules
• Color flux-tube nature of the states $T_{cs}(2900)$ and $T_{c\bar{s}}^a(2900)$
• Possibility of $T_{c\bar{s}}(2900)$ as the resonance-like structure induced by threshold effects