Charmed-strange Meson Spectrum: Old and New Problems

TL;DR

This paper investigates the spectrum and decay properties of higher excited charmed-strange mesons, including newly observed states, using a constituent quark model to provide a unified theoretical description aligning with recent experimental findings.

Contribution

It extends previous studies to include multiple excited charmed-strange mesons, offering a comprehensive theoretical analysis that matches recent experimental observations and predicts properties of missing states.

Findings

Successful description of the $D_{s1}^{ ext{*}}(2860)$ and $D_{s3}^{ ext{*}}(2860)$ states

Predictions for masses and decays of other excited charmed-strange mesons

Unified framework for understanding heavy quark meson spectrum

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 $\bar{D}^{0}K^{-}$ structure seen in the $B_{s}^{0}\to \bar{D}^{0}K^{-}\pi^{+}$ reaction and with invariant mass $2.86\,{\rm GeV}$ is an admixture of a spin-$1$ and a spin-$3$ resonances. Motivated by the good agreement between our theoretical predictions some time ago and the properties extracted from the experiment of the $D_{s1}^{\ast}(2860)$ and $D_{s3}^{\ast}(2860)$ states, we perform an extension of the study of the strong decay properties of the $D_{sJ}^{\ast}(2860)$ and present the same analysis for the $D_{s1}^{\ast}(2700)$ 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 $D_{s1}^{\ast}(2700)$, $D_{sJ}^{\ast}(2860)$ 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.