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

¹ D. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University, 119991 Moscow, Russia
² M. V. Lomonosov Moscow State University, Faculty of Physics, 119991 Moscow, Russia
³ A. I. Alikhanov Institute for Theoretical and Experimental Physics, 117218 Moscow, Russia
⁴ National Research Nuclear University MEPhI, 115409 Moscow, Russia

^a e-mail: anastasiia.kozachuk@cern.ch

Published online: 22 March 2017

Abstract

We study rare radiative leptonic decays B_(s) → e⁺e⁻γ and B_(s) → μ⁺μ⁻γ within relativistic quark model. In addition to previous analysis we give the estimations of the branching ratios for four values of the minimal photon energy, which correspond to photon selection criteria of the Belle and LHCb detectors. We find out that the branching ratios only slightly change. The highest values corresponding to E_min^γ = 80MeV are B($${\overline{\text{B}}}_{\text{s}}^0$$ → e⁺e⁻γ) = 18.5 × 10⁻⁹ and B(B_s⁰ → μ⁺μ⁻γ) = 11.9 × 10⁻⁹. We present the distribution of the forward-backward asymmetry.