Probing Baryogenesis with Radiative Beauty Decay and Electron EDM

TL;DR

This paper explores how the Large Hadron Collider can probe electroweak baryogenesis and CP violation through electron EDM measurements and flavor physics, highlighting the role of the general two Higgs doublet model.

Contribution

It identifies a chiral-enhanced interference effect in top-bottom quark transitions that links baryogenesis, electron EDM, and flavor observables within the g2HDM.

Findings

b o s\gamma decay is sensitive to EWBG and eEDM

The $ ext{ extbackslash}Delta A_{CP}$ observable at Belle II is crucial

g2HDM can accommodate EWBG while surviving eEDM constraints

Abstract

With the Large Hadron Collider (LHC) running, we should probe electroweak baryogenesis (EWBG) while probing $CP$ violation (CPV) with electron electric dipole moment (eEDM). Rooted in the flavor structure of the Standard Model (SM), the general two Higgs doublet model (g2HDM) with a second set of Yukawa couplings can deliver EWBG while surviving eEDM. We point out a chiral-enhanced top-bottom interference effect that makes $b \to s\gamma$ decay an exquisite window on EWBG and eEDM, and illustrate the importance of the $\Delta A_{CP}$ observable at Belle II.