Decays of charged $B$-mesons into three charged leptons and a neutrino

TL;DR

This paper provides detailed Standard Model predictions for four-leptonic decays of charged B-mesons, including decay widths, distributions, and asymmetries, accounting for photon emission effects from quarks and leptons.

Contribution

It offers the first comprehensive calculation of decay properties and asymmetries for these specific B-meson decay channels, including photon emission contributions.

Findings

Predicted decay widths and distributions for four-leptonic B-meson decays.

Quantified forward-backward lepton asymmetries.

Analyzed photon emission effects from quarks and leptons.

Abstract

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 $B^- \to \mu^+\mu^- {\bar \nu}_e\, e^-$, $B^- \to e^+ e^- {\bar \nu}_\mu\,\mu^-$, $B^- \to \mu^+ \mu^-{\bar \nu}_\mu\,\mu^-$, and $B^- \to e^+ e^- {\bar \nu}_e\, e^-$. 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.