Eur. Phys. J. A (2026) 62: 104
https://doi.org/10.1140/epja/s10050-026-01876-7

Regular Article - Theoretical Physics

The $B^{+(0)}\to {\overline{D}}^{0(-)}D_{s0}^{\ast }{(2317)}^{+}$ decays and the molecular structure of $D_{s0}^{\ast }(2317)$

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 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: 11 February 2026
Accepted: 29 April 2026
Published online: 25 May 2026

Abstract

We have conducted a study of the $B^{+(0)}\to {\overline{D}}^{0(-)}D_{s0}^{\ast }{(2317)}^{+}$ reactions from the perspective that the $D_{s0}^{\ast }(2317)$ resonance is a molecular state of the DK and $D_s\eta$ components. We have followed a method to evaluate the branching fractions obtaining information from the experimental data on the $B^{+}\to {\overline{D}}^0{K}^{+}{D}^0$, $B^{+}\to {\overline{D}}^0{K}^0{D}^{+}$, $B^0\to D^{-}{K}^{+}{D}^0$, $B^0\to D^{-}{K}^0{D}^{+}$ reactions, which have the $D^0{K}^{+}$ and $D^{+}{K}^0$ pairs in the final state. The approach concentrates the dynamics of the weak process in the branching ratios of these reactions and pays attention to the propagation of the DK components and their strong interaction to form the $D_{s0}^{\ast }(2317)$ resonance. By means of two free parameters, we are able to describe these six rates, showing consistency with the molecular picture of the $D_{s0}^{\ast }(2317)$ state.