Discovering the $D_0^{\ast }(2100)$ in $B$ semileptonic decays

M. -L. Du, F. -K. Guo, C. Hanhart +3

The mass and width of the lightest scalar open-charm state listed in the Review of Particle Physics, the $D_0^{\ast }(2300)$, are in puzzling tension with predictions from unitarized…