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The module for the generation of $B_c$ meson decays into $J/\psi + n\pi$ and$B_s^{(*)} + n\pi$ ($n\le 4$) is implemented into EvtGen program package. Thedecay amplitudes are calculated in the frame work of factorization model.Within this approach the decay can be represented as $B_c$ decay into $J/\psi(B_s)+W^*$ followed by the virtual $W^*$-boson decay into the final set of$\pi$-mesons. The described calculation technique allows to adopt theparameters of $W^*\to n\pi$ transition from the analysis of $\tau$ decay into$\nu_\tau+n\pi$. Comparison with available theoretical predictions isperformed.

BC_NPI module for the analysis of Bc -> J/psi +n pi and Bc -> B_s +n pi decays within the EvtGen package