Semileptonic decays <inline-formula><tex-math id="M1">\begin{document}${{ B}_{ c} \to (\eta_{ c},{ J}/\psi) { l} \bar{\nu}_{ l}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2019-0339_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2019-0339_M1.png"/></alternatives></inline-formula> in the “PQCD+Lattice” approach

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