A. Kozachuk

Rare radiative leptonic B-decays

We obtain predictions for

Revisiting nonfactorizable charm-loop effects in exclusive FCNC B-decays

B_{(s)}\to e^+e^-\gamma

Form factors and differential distributions in rare radiative lep-tonic B-decays

and

Rare FCNC radiative leptonic

B_{(s)}\to \mu^+\mu^-\gamma

B_{s,d}\to \gamma l^+l^-

decays. All the contributions containing long-distance QCD effects are calculated in the framework of relativistic quark model. The contributions of the light vector-meson resonances related to the virtual photon emission from valence quarks of the

decays in the standard model

B

Annihilation-type rare radiative B(s)→Vγ decays

-meson are included. The highest branching ratios for the radiative leptonic B-decays are

Long-distance QCD effects in FCNC

{\cal B}(\bar B^0_s\to e^+e^-\gamma)=18.8\times10^{-9}

B\to \gamma l^+l^-

and

decays.

{\cal B}(B^0_s\to \mu^+\mu^-\gamma)=12.2\times10^{-9}