Production of charged π mesons in exclusive Bc → V(P) plus nπ decays

The paper is devoted to vector or pseudoscalar heavy quarkonia production psi('), B-s(*)s in association with three or five charged pi mesons in exclusive B-c-meson decays. Using available form factor parametrizations and spectral functions of W -> 3 pi, W -> 5 pi transitions, we obtain branching fractions of these decays and distributions over the invariant mass of the (n pi) system.