Closing the Gap on $R_{D^{\ast }}$ by including longitudinal effects

J. E. Chavez-Saab, Genaro Toledo

Measurements of the $R_{D^{\ast }}\equiv \mathrm{Br}(B\to \tau \nu D^{\ast })/\mathrm{Br}(B\to e\nu D^{\ast })$ parameter remain in tension with the standard model prediction, despite recent re…