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In the framework of the Standard Model we present a new theoretical predictions for partial widths, double and single differential distributions for four-leptonic decays of B_d - mesons. We consider the contributions of ω(782) and ρ(770) - resonances, vector charmonium resonances contributions, non-resonance contribution of the bb¯ - pairs, leading contribution of “weak annihilation” and bremsstrahlung. We use the model of vector meson dominance for calculation of resonances contributions and take into account a set of new contributions that were not previously considered https://indico.cern.ch/event/1133591/contributions/5029773/