Semi-leptonic decays $B\to D^{(\ast )}(1S,2S)\ell {\nu }_{\ell }$ within the covariant light-front approach

Zhi-Jie Sun, Zhi-Qing Zhang, Shi-Chen Xue +1

We present a systematic analysis of the semi-leptonic decays $B_{(s)}\to D_{(s)}(1S,2S)\ell {\nu }_{\ell }$ and $B_{(s)}\to D_{(s)}^{\ast }(1S,2S)\ell {\nu }_{\ell }$ with $\ell =e,\mu ,\tau$ within the covarian…