Probing Electroweak Baryogenesis induced by extra bottom Yukawa coupling via EDMs and collider signatures

TL;DR

This paper explores how additional bottom Yukawa couplings in a two Higgs doublet model can be tested through EDM measurements and collider experiments, providing new avenues for electroweak baryogenesis detection.

Contribution

It introduces a comprehensive analysis of probing electroweak baryogenesis via extra bottom Yukawa couplings using EDMs and collider signatures, including novel search strategies at the LHC.

Findings

Potential discovery of CP-odd scalar A via specific collider processes.

Constraints on the parameter space from Higgs signal strengths and heavy Higgs searches.

Complementary probes from CP asymmetry in B decays.

Abstract

We study the prospect of probing electroweak baryogenesis driven by an extra bottom Yukawa coupling $\rho_{bb}$ in a general two Higgs doublet model via electric dipole moment (EDM) measurements and at the collider experiments. The parameter space receives meaningful constraints from 125 GeV Higgs $h$ boson signal strength measurements as well as several heavy Higgs boson searches at the Large Hadron Collider (LHC). In addition, we show that the asymmetry of the CP asymmetry of inclusive $B\to X_s \gamma$ decay would provide complementary probe. A discovery is possible at the LHC via $bg\to bA \to b Z h$ process if $|\rho_{bb}|\sim 0.15$ and $250~\mbox{GeV}\lesssim m_A \lesssim 350$ GeV, where $A$ is CP odd scalar. For $m_A> 2 m_t$ threshold, where $m_t$ is the top quark mass, one may also discover $bg\to bA \to b t \bar t$ at the high luminosity LHC run if an extra top Yukawa coupling $|\rho_{tt}|\sim0.5$, though it may suffer from systematic uncertainties. For completeness we study $gg\to t \bar t A \to t \bar t b \bar b $ but find it not promising.