A multiquark description of the $D_{sJ}(2860)$ and $D_{sJ}(2700)$

TL;DR

This paper investigates the structure of certain open-charm mesons, proposing a mixed quark-antiquark and four-quark model to explain their properties and quantum numbers, supported by decay width analysis.

Contribution

It introduces a comprehensive framework combining quark-antiquark and four-quark components to better describe open-charm mesons, including the $D_{sJ}$ states, and explores their quantum number assignments.

Findings

Negative parity and 2+ states are explained by quark-antiquark components.

Mixing of two- and four-quark states improves the description of 0+ and 1+ mesons.

Decay widths help distinguish between different quantum number assignments.

Abstract

Within a theoretical framework that accounts for all open-charm mesons, including the $D_0^*(2308)$, the $D_{sJ}^*(2317)$ and the $D_{sJ}(2460)$, we analyze the structure and explore possible quantum number assignments for the $D_{sJ}(2860)$ and the $D_{sJ}(2700)$ mesons reported by BABAR and Belle Collaborations. The open-charm sector is properly described if considered as a combination of conventional quark-antiquark states and four--quark components. All negative parity and $2^+$ states can be understood in terms only of $q\bar q$ components, however the description of the $0^+$ and $1^+$ mesons is improved whenever the mixing between two-- and four--quarks configurations is included. We analyze all possible quantum number assignments for the $D_{sJ}(2860)$ in terms of both $c\bar s$ and $cn\bar s\bar n$ configurations. We discuss the role played by the electromagnetic and strong decay widths as basic tools to distinguish among them. The broad structure reported by BABAR near 2.7 GeV is also analyzed.