Semileptonic decays $B_c\to(\eta_c,J/\Psi)l\nu$ in the perturbative QCD approach

In this paper we study the semileptonic decays of B−c → (ηc, J/Ψ)l−1. We first evaluate the Bc → (ηc, J/Ψ) transition form factors F0(q2), F+(q2), V(q2) and A0,1,2(q2) by employing the pQCD factorization approach, and then we calculate the branching ratios for all considered semileptonic decays. Based on the numerical results and the phenomenological analysis, we find that: (a) the pQCD predictions for the values of the Bc → ηc and Bc → J/Ψ transition form factors agree well with those obtained by using other methods; (b) the pQCD predictions for the branching ratios of the considered decays are Br(B−c→ηce−e(μ−μ)) = (4.41)×10−3, Br(B−c→ηcτ−τ) = (1.37)×10−3, Br(B−c→J/Ψe−e(μ−μ)) = (10.03)×10−3, and Br(B−c→J/Ψτ−τ) = (2.92)×10−3; and (c) we also define and calculate two ratios of the branching ratios Rηc and RJ/Ψ, which will be tested by LHCb and the forthcoming Super-B experiments.

Note:

12 pages, 2 figures, typos removed, some modifications in content and the numerical results. To be published in Chinese Physics C

12.38.Bx
13.25.Hw
14.40.Nd
pQCD
B meson
semileptonic decay
quantum chromodynamics: perturbation theory
form factor: transition
branching ratio: ratio
B/c: semileptonic decay

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Semileptonic decays Bc→(ηc,J/Ψ)lνB_c\to(\eta_c,J/\Psi)l\nuBc​→(ηc​,J/Ψ)lν in the perturbative QCD approach

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Semileptonic decays $B_c\to(\eta_c,J/\Psi)l\nu$ in the perturbative QCD approach