Electroweak baryogenesis from charged current anomalies in $B$ meson decays

TL;DR

This paper shows that new physics explaining B meson anomalies can also generate the universe's matter-antimatter asymmetry through CP violation, linking flavor physics to cosmology.

Contribution

It demonstrates that a two Higgs doublet model with complex Yukawa couplings can simultaneously explain B anomalies and baryon asymmetry, a novel connection.

Findings

Significant baryon asymmetry can be generated within experimental constraints.

The model remains viable after flavor and electric dipole moment constraints.

Future experiments can test these scenarios.

Abstract

We demonstrate for the first time that new physics explaining the long standing charged $B$ meson anomalies, $R(D^{(*)})$, can be the source of CP violation that explains the observed baryon asymmetry of the universe (BAU). We consider the general two Higgs doublet model with complex Yukawa couplings and compute the BAU in the semiclassical formalism, using a novel analytic approximation for the latter. After imposing constraints from both flavor observables and the electron electric dipole moment (eEDM), we find that a significant BAU can still be generated for a variety of benchmark points in the parameter space, assuming the occurrence of a sufficiently strong first order electroweak phase transition. These scenarios, which explain both the $R(D^{(*)})$ flavor anomalies and the BAU, can be probed with future eEDM experiments and Higgs factories measurements.