Abstract
We consider a scenario in which an extra bottom Yukawa coupling can drive electroweak baryogenesis in the general two-Higgs doublet model. It is found that the new bottom Yukawa coupling with $\mathcal{O}(0.1)$ in magnitude can generate the sufficient baryon asymmetry without conflicting existing data. We point out that future measurements of the bottom Yukawa coupling at High-Luminosity Large Hadron Collider and International Linear Collider, together with the CP asymmetry of $B\to X_s\gamma$ at SuperKEKB provide exquisite probes for this scenario.
Highlights
The existence of the baryon asymmetry of the Universe (BAU) is firmly established by various cosmological observations such as the cosmic microwave background and big-bang nucleosynthesis [1]
Since its numerical value is unknown in the current model, we infer it from the results in the minimal supersymmetric standard model, i.e., Δβ 1⁄4 Oð10−4 − 10−2Þ [50]
We make use of the vacuum expectation values (VEVs) insertion approximation that may lead to the overestimated BAU
Summary
The existence of the baryon asymmetry of the Universe (BAU) is firmly established by various cosmological observations such as the cosmic microwave background and big-bang nucleosynthesis [1]. Wellstudied examples are new scalar or vector particles that modify the Higgs potential by tree-level mixings and/or loop effects In addition to these conventional cases, it has been pointed out that even fermions could induce such an effect if they couple to the Higgs boson strongly [5] Except for some corner of the parameter space, most EWBG-viable regions can fully be covered by Higgs signal strength measurements at HighLuminosity LHC (HL-LHC) and future colliders such as International Linear Collider (ILC) Such a scenario can be tested by B physics observables, especially the branching ratio and CP asymmetry of B → Xsγ at SuperKEKB.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
