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Theoretical study of the $B^+\to D^-D_s^{+}π^+$ reaction

Prompted by the recent discoveries of $T_{c\bar{s}0}(2900)^{++}$ in the $D_s^+π^+$ invariant mass distribution of $B^+\to D^-D_s^+π^+$ process, we present a model that hopes to help us investigate the nature of $T_{c\bar{s}0}(2900)^{++}$ by reproducing the mass distribution of $D^-π^+, D_s^+π^+$ and $D^-D_s^+$ in $B^+ \to D^-D_s^+π^+$ decays. The structure of the triangular singularity peak generated from the $χ_{c1}D^{*+}K^{*+}$ loop near the $D^{*+}K^{*+}$ threshold is considered in our model may be the experimentally discovered resonance-like state structure $T_{c\bar{s}0}(2900)^{++}$. In addition, we employ a coupled-channel approach to describe the dominant contribution of the $Dπ$ $S\text{-wave}$ amplitude, and also consider other excitations. Our model provides a well fit to the invariant mass distributions of $D^-π^+, D_s^+π^+$ and $D^-D_s^+$ simultaneously.