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We study the semileptonic decays of the $B_c$ meson into final charmoniumstates within the standard model and beyond. The relevant hadronic transitionform factors are calculated in the framework of the covariant confined quarkmodel developed by us. We focus on the tau mode of these decays, which mayprovide some hints of new physics effects. We extend the standard model byassuming a general effective Hamiltonian describing the $b\to c\tau\nu$transition, which consists of the full set of the four-fermion operators. Wethen obtain experimental constraints on the Wilson coefficients correspondingto each operator and provide predictions for the branching fractions and otherpolarization observables in different new physics scenarios.

Implications of new physics in the decays $B_c \to (J/\psi,\eta_c)\tau\nu$