Rare Decays of Neutral B Mesons into Four Charged Leptons in the Standard Model

part of the Standard Model (SM), we present new theoretical predictions for the branching ratio and differential distributions for the B̅_d→μ^ + μ^ - e^ + e^ - decay. We take into consideration the contributions ρ^0(770) and ω (782) of resonances; the main contributions of four charmonium resonances: ψ (3770) , ψ (4040) , ψ (4160) , and ψ (4415) ; the contributions of the tails from J / . -0emψ and ψ (2S) resonances; and the nonresonant contribution of the b 1ptb̅ pairs, bremsstrahlung, and the contribution of the weak annihilation. We use the model of vector meson dominance (VMD) for calculating resonances contributions.