Decoding the nature of Zcs(3985) and establishing the spectrum of charged heavy quarkoniumlike states in chiral effective field theory

We study the newly observed charmoniumlike state Z(cs)(3985) in the framework of chiral effective field theory. The interaction kernel of the (D) over bar (s) D*/ (D) over bar (s)* D system is calculated up to the next-to-leading order with the explicit chiral dynamics. With the fitted parameters extracted from the Z(cs)(3985) data as inputs, the mass, width, and event distributions of the Z(cs)(3985) are very consistent with the experimental measurements. Our studies strongly support the Z(cs)(3985) as the partner of the Z(cs)(3985) in the SU(3)(f) symmetry and the (D) over bar (s) D*/ (D) over bar (s)* D Dmolecular resonance with the same dynamical origin as the other charged heavy quarkonium-like states. We precisely predict the resonance parameters of the unobserved states in (D) over bar (s)* D*, B-s*(B) over bar /B-s(B) over bar*, and B-s*(B) over bar* systems, and establish a complete spectrum of the charged charmoniumlike and bottomoniumlike states with the I(J(P)) quantum numbers 1(1(+)) 1/2 (1(+)), respectively.

Automated summary

In this study, the charmoniumlike state Z(cs)(3985) is analyzed within the framework of chiral effective field theory, showing consistent mass, width, and event distributions with experimental measurements. The interaction of the (D) over bar (s) D*/ (D) over bar (s)* D system is calculated up to next-to-leading order, supporting the Z(cs)(3985) as a molecular resonance with the same origin as other charged heavy quarkonium-like states. Precise predictions for the parameters of unobserved states in various systems are made, establishing a complete spectrum of charged charmoniumlike and bottomoniumlike states with specific quantum numbers.