Further tests of lepton flavour universality from the charged lepton energy distribution in $b\to c$ semileptonic decays: The case of ${\Lambda }_b\to {\Lambda }_c\ell {\bar{\nu }}_{\ell }$

Neus Penalva, Eliecer Hernández, Juan Nieves

In a general framework, valid for any $H\to H^{\prime }{\ell }^{-}{\bar{\nu }}_{\ell }$ semileptonic decay, we analyze the $d^2\Gamma /(d\omega d\cos {\theta }_{\ell })$ and $d^2\Gamma /(d\omega d{E}_{\ell })$ distributions, with $\omega$ being the…