Abstract
We study the prospect of probing electroweak baryogenesis driven by an extra bottom Yukawa coupling ρbb 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 → Xsγ decay would provide complementary probe. A discovery is possible at the LHC via bg → bA → bZh process if |ρbb| ∼ 0.15 and 250 GeV≲ mA ≲ 350 GeV, where A is CP odd scalar. For mA> 2mt threshold, where mt is the top quark mass, one may also discover bg → bA → btoverline{t} at the high luminosity LHC run if an extra top Yukawa coupling |ρtt| ∼ 0.5, though it may suffer from systematic uncertainties. For completeness we study gg → toverline{t}A → toverline{t}boverline{b} but find it not promising.
Highlights
We study the prospect of probing electroweak baryogenesis driven by an extra bottom Yukawa coupling ρbb in a general two Higgs doublet model via electric dipole moment (EDM) measurements and at the collider experiments
Taking three benchmark points for illustration, two below 2mt threshold and one above, we have shown that a discovery is possible at the Large Hadron Collider (LHC) via ρbb induced bg → bA → bZh process for mA < 2mt
With a simple rescaling of the significances in table 4, we find that |Im(ρbb)| 0.05 and 0.04 can be excluded for BPa and BPb with full HLLHC dataset
Summary
The particle content of g2HDM is the SM plus additional Higgs doublet This model induces flavor-changing neutral current (FCNC) processes mediated by the neutral Higgs bosons at tree level. Since we do not try to connect the model to any specific UV completions, we do not impose the Z2 symmetry or something similar, which enables us to discuss physics at O(100) GeV scale in wider perspective In this bottom-up approach, the tree-level FCNC processes are possible as long as the experimental data allow, and sources of CP violation are much richer than 2HDMs with some discrete symmetries. Together with electron EDM and ∆ACP of B(B → Xsγ), these processes can probe significant part of the parameter space for ρbb-EWBG. When both ρbb and ρtt are nonzero, one may have gg → bbA/H → bbtt, which are covered in refs. [101,102,103,104,105]
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