Charmed-strange meson spectrum: Old and new problems

Abstract

The LHCb Collaboration has recently reported the observation for the first time of a spin-3 resonance in the heavy quark sector. They have shown that the ${\overline{D}}^{0}{K}^{\ensuremath{-}}$ structure seen in the ${B}_{s}^{0}\ensuremath{\rightarrow}{\overline{D}}^{0}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ reaction and with invariant mass 2.86 GeV is an admixture of a spin-1 and a spin-3 resonance. Motivated by the good agreement between our theoretical predictions some time ago and the properties extracted from the experiment of the ${D}_{s1}^{*}(2860)$ and ${D}_{s3}^{*}(2860)$ states, we perform an extension of the study of the strong decay properties of the ${D}_{sJ}^{*}(2860)$ and present the same analysis for the ${D}_{s1}^{*}(2700)$ and ${D}_{sJ}(3040)$ mesons. This provides a unified and simultaneous description of the three higher excited charmed-strange resonances observed until now. For completeness, we present theoretical results for masses and strong decays of the low-lying charmed-strange mesons and those experimental missing states which belong to the spin multiplets of the discovered ${D}_{s1}^{*}(2700)$, ${D}_{sJ}^{*}(2860)$ and ${D}_{sJ}(3040)$ resonances. The theoretical framework used is a constituent quark model which successfully describes hadron phenomenology from light to heavy quark sectors.