In the framework of the Standard Model we present predictions for partial widths, double and single differential distributions, and forward--backward lepton asymmetries for four-leptonic decays $B^- to mu^+mu^- {bar u}_e, e^-$, $B^- to e^+ e^- {bar u}_mu,mu^-$, $B^- to mu^+ mu^-{bar u}_mu,mu^-$, and $B^- to e^+ e^- {bar u}_e, e^-$. We consider the contributions of virtual photon emission from the light and heavy quarks of the $B^-$--meson, and we include bremsstrahlung of a virtual photon from the charged lepton in the final state. We use the model of vector meson dominance for calculation of virtual photon emission by the light quark of the $B^-$--meson and take into account the isotopic correction.
تحميل البحث