Abstract
In light of prospects for measurements of Bc → D(∗)lv decays in the upcoming Upgrade II of the LHC, we show that by using calculated Bc → D(∗) form factors a competitive extraction of the |Vub| CKM matrix element from the {B}_cto Dmu {overline{v}}_{mu } decay might be possible. To minimize experimental and theoretical uncertainties we provide the ratio |Vub|/|Vcb| by normalizing the {B}_cto {D}^{left(ast right)}mu {overline{v}}_{mu } to {B}_cto J/psi mu {overline{v}}_{mu } decay. We also briefly examine the suggestion to extract |Vub|/|Vcs| from the theoretically interesting ratio of {B}_cto {D}^0e{overline{v}}_e and {B}_cto {B}_se{overline{v}}_e decay rates in the zero-recoil limit. With the present average value of |Vub|, the predicted branching ratios are estimated to be BRleft({B}_cto {D}^0mu {overline{nu}}_{mu}right)=left(2.4pm 0.4right)cdotp {10}^{-5} and BRleft({B}_cto {D}^{ast}mu {overline{nu}}_{mu}right)=left(7pm 3right)cdotp {10}^{-5}, and the semileptonic ratios for testing the lepton flavour universality in these Bc decays are Rc(D0) = 0.64 ± 0.05 and Rc(D∗) = 0.55 ± 0.05. We also provide q2 distributions and various angular observables of Bc→ D(∗)lν decays.
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