Decoding the nature of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi><mml:mi>s</mml:mi></mml:mrow></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>3985</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math> and establishing the spectrum of charged heavy quarkoniumlike states in chiral effective field theory
Bo Wang, Lu Meng, Shi-Lin Zhu
Abstract
We study the newly observed charmoniumlike state ${Z}_{cs}(3985)$ in the framework of chiral effective field theory. The interaction kernel of the ${\overline{D}}_{s}{D}^{*}/{\overline{D}}_{s}^{*}D$ system is calculated up to the next-to-leading order with the explicit chiral dynamics. With the fitted parameters extracted from the ${Z}_{c}(3900)$ 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 ${Z}_{c}(3900)$ in the ${\mathrm{SU}(3)}_{f}$ symmetry and the ${\overline{D}}_{s}{D}^{*}/{\overline{D}}_{s}^{*}D$ molecular resonance with the same dynamical origin as the other charged heavy quarkoniumlike states. We precisely predict the resonance parameters of the unobserved states in ${\overline{D}}_{s}^{*}{D}^{*}$, ${B}_{s}^{*}\overline{B}/{B}_{s}{\overline{B}}^{*}$, and ${B}_{s}^{*}{\overline{B}}^{*}$ systems, and establish a complete spectrum of the charged charmoniumlike and bottomoniumlike states with the $I({J}^{P})$ quantum numbers $1({1}^{+})$ and $\frac{1}{2}({1}^{+})$, respectively.