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The $B_{c}$ ${\to}$ $J/{\psi}{\pi}$, ${\eta}_{c}{\pi}$ decays are studied inthe scheme of the QCD factorization approach. The branching ratios arecalculated with the asymptotic distribution amplitude of the pion. The charmquark mass effect is considered. We find that the mass effect on the branchingratios is small.

Study of $B_{c}^{-}$ ${\to}$ $J/{\psi}{\pi}^{-}$, ${\eta}_{c}{\pi}^{-}$ Decays with QCD Factorization