Eur. Phys. J. C (2026) 86: 242
https://doi.org/10.1140/epjc/s10052-026-15449-x

Regular Article - Theoretical Physics

The $D_{s0}^{\ast }{(2317)}^{+}$ decay to $D_s^{+}{\pi }^0$ and $D_s^{\ast +}\gamma$

¹ Department of Physics, Guangxi Normal University, 541004, Guilin, China
² Guangxi Key Laboratory of Nuclear Physics and Technology, Guangxi Normal University, 541004, Guilin, China
³ School of Physics, Zhengzhou University, 450001, Zhengzhou, China
⁴ Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna, Apartado 22085, 46071, Valencia, Spain

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Received: 16 December 2025
Accepted: 13 February 2026
Published online: 10 March 2026

Abstract

We study the strong decay of $D_{s0}^{\ast }{(2317)}^{+}$ to $D_s^{+}{\pi }^0$ considering the coupled channels of $D^0{K}^{+},D^{+}{K}^0,D_s^{+}\eta$ and $D_s^{+}{\pi }^0$ within a picture for the interaction based on the local hidden gauge approach. We also address the problem of the radiative decay to $D_s^{\ast +}\gamma$, using the same information obtained from the molecular picture. We obtain a strong width of the $D_{s0}^{\ast }{(2317)}^{+}$ of about $77\mathrm{k}eV$ from coupled channels interaction and a radiative decay of about $1.7\mathrm{k}eV$. We also show that the extra consideration of ${\pi }^0-\eta$ mixing can double the strong decay width to values around $140\mathrm{k}eV$. The anomalous terms for the radiative decay are considered for the first time, but they are found negligible. We make a thorough discussion of this and other results to the light of the recent measurement of Belle for the ratio of these two decay modes, and make a call for the precise measurement of the two decay widths independently to clarify the present situation concerning the nature of the $D_{s0}^{\ast }{(2317)}^{+}$ state.