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- W2938994039 abstract "In this paper, we studied the semileptonic decays $B_c^- to (eta_c, J/psi) l ^- bar{nu}_l$ by employing the PQCD factorization approach, using the newly defined distribution amplitudes of the $B_c$ meson and the new kind of parametrization for extrapolation of the form factors , and also taking into account the lattice QCD results about the relevant form factors at several points. We found the following main results: (a) the PQCD predictions for the branching ratios of $B_c to (eta_c,J/psi) l bar{nu}$ decays will become a little smaller by about $(5-16)%$ when the lattice input are taken into account in the extrapolation of the relevant form factors; (b) the PQCD predictions for the ratio $R_{eta_c, J/psi}$ and the longitudinal polarization $P_{tau}$ are $R_{eta_c}=0.34pm 0.01 , R_{J/psi}=0.28pm 0.01$, $P_{tau}(eta_c) = 0.37pm 0.01$ and $P_{tau}(J/psi) = -0.55 pm 0.01$ ; and (c) after the inclusion of the lattice input the theoretical predictions changed slightly: $R_{eta_c}=0.31pm 0.01$, $ R_{ J/psi}=0.27pm 0.01$, $P_{tau}( eta_c) = 0.36 pm 0.01$ and $P_{tau}( J/psi) = -0.53pm 0.01$. The theoretical predictions for $R_{ J/psi}$ agree with the measured one within errors, and other predictions could be tested in the near future LHCb experiments." @default.
- W2938994039 created "2019-04-25" @default.
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- W2938994039 date "2020-02-01" @default.
- W2938994039 modified "2023-09-26" @default.
- W2938994039 title "Semileptonic decays in the “PQCD+Lattice” approach *" @default.
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- W2938994039 doi "https://doi.org/10.1088/1674-1137/44/2/023104" @default.
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