July 31, 2018 to August 6, 2018
Maynooth University
Europe/Dublin timezone

Rare FCNC radiative leptonic B→ γl+l- decays in the standard model

Aug 1, 2018, 2:40 PM
Hall H (Arts Bldg.)

Hall H

Arts Bldg.

Talk C: Heavy quarks Heavy quarks


Anastasiia Kozachuk (M.V. Lomonosov Moscow State University (RU))


We revisit rare radiative leptonic decays B_(s,d) → γee and B_(s,d) → γμμ in the standardmodel and provide the updated estimates for various differential distributions (the branching ratios, the forward-backward asymmetry, and Rμ=e, the ratio of the differential distribution for muons over electrons in the final state). The new ingredients of this work compared to the existing theoretical analyses are the following: (i) we calculate all B → γ form factors induced by the vector, axial-vector, tensor and pseudotensor quark currents within the relativistic dispersion approach based on the constituent quark picture; (ii) we perform a detailed analysis of the charm-loop contributions to radiative leptonic decays: we obtain constraints imposed by electromagnetic gauge invariance and discuss the existing ambiguities in the charmonia contributions.

Primary authors

Anastasiia Kozachuk (M.V. Lomonosov Moscow State University (RU)) Dmitri Melikhov (HEPHY) Nikolai Nikitin (M.V. Lomonosov Moscow State University (RU))

Presentation materials