Rare FCNC radiative leptonic B<sub>s,d</sub> →γl<sup>+</sup>l<sup>-</sup> decays in the standard model

Author(s)
Anastasiia Kozachuk, Dmitri Melikhov, Nikolai Nikitin
Abstract

We revisit rare radiative leptonic decays Bs,d→γe+e- and Bs,d→γμ+μ- in the standard model 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 Bd→γ and Bs→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.

Organisation(s)
Particle Physics
External organisation(s)
Lomonosov Moscow State University (MSU), Österreichische Akademie der Wissenschaften (ÖAW), A.I. Alikhanov Institute of Theoretical and Experimental Physics (ITEP), Universität Wien
Journal
Physical Review D
Volume
97
No. of pages
23
ISSN
2470-0010
DOI
https://doi.org/10.1103/PhysRevD.97.053007
Publication date
03-2018
Peer reviewed
Yes
Austrian Fields of Science 2012
103034 Particle physics
ASJC Scopus subject areas
Physics and Astronomy (miscellaneous)
Portal url
https://ucris.univie.ac.at/portal/en/publications/rare-fcnc-radiative-leptonic-bsd-ll-decays-in-the-standard-model(a503c648-b54a-44fc-b8f0-5c1d01818364).html