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Semileptonic decays $B_c o(eta_c,J/Psi)l
u$ in the perturbative QCD approach | | Wen-Fei Wang
; Ying-Ying Fan
; Zhen-Jun Xiao
; | | Date: |
24 Dec 2012 | | Abstract: | In this paper we study the semileptonic decays of $B_c^- o
(eta_c,J/psi)l^-ar
u_l$ (here $l$ stands for $e, mu$ and $ au$). We
firstly evaluate the $B_c o (eta_c,J/Psi)$ transition form factors
$F_0(q^2)$, $F_+(q^2)$, $V(q^2)$ and $A_{0,1,2}(q^2)$ 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 $B_c o eta_c$ and $B_c o J/Psi$ transition form factors
agree with those obtained by using other methods; (b) the pQCD predictions for
the branching ratios for the considered modes are $Br(B_c^- oeta_c
e^-ar
u_e(mu^-ar
u_mu)) =(4.34^{+1.18}_{-1.05}) imes10^{-3}$,
$Br(B_c^- oeta_c au^-ar
u_ au) =(1.44^{+0.39}_{-0.35}) imes10^{-3}$,
$Br(B_c^- o J/Psi e^-ar
u_e(mu^-ar
u_mu))
=(8.56^{+1.07}_{-0.98}) imes10^{-3}$, and $Br(B_c^- o
J/Psi au^-ar
u_ au) =(2.47^{+0.31}_{-0.28}) imes10^{-3}$; and (c) we
also define and calculate two ratios of the branching ratios $R_{eta_c}$ and
$R_{J/Psi}$, which will be tested by LHCb and the forthcoming Super-B
experiments. | | Source: | arXiv, 1212.5903 | | Services: | Forum | Review | PDF | Favorites | |
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