Anomalous B meson mixing and baryogenesis in a two Higgs doublet model with top-charm flavor violation

Abstract

There exist experimental hints from the B sector for CP violation beyond the Standard Model (SM) CKM paradigm. An anomalous dimuon asymmetry was reported by the D0 collaboration, while tension exists between $B\to \tau \nu$ and $S_{\psi K}$. These measurements, disfavoring the SM at the ~3$\sigma$ level, can be explained by new physics in both $B_d$-${\bar{B}}_d$ and $B_s$- ${\bar{B}}_s$ mixing, arising from (1) new bosonic degrees of freedom at or near the electroweak scale, and (2) new, large CP-violating phases. These two new physics ingredients are precisely what is required for electroweak baryogenesis to work in an extension of the SM. We show that a simple two Higgs doublet model with top-charm flavor violation can explain the B anomalies and the baryon asymmetry of the Universe. Moreover, the presence of a large relative phase in the top-charm Yukawa coupling, favored by $B_{d,s}$-${\bar{B}}_{d,s}$ mixing, weakens constraints from ${\epsilon }_K$ and $b\to s\gamma$, allowing for a light charged Higgs mass of O(100 GeV).

8 pages, 5 figures

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• Two-Step Electroweak Baryogenesis
• Electroweak Beautygenesis: From b {\to} s CP-violation to the Cosmic Baryon Asymmetry
• Electroweak Baryogenesis with Lepton Flavor Violation
• Measurement of the semileptonic charge asymmetry in B0 meson mixing with the D0 detector
• The role of leptons in electroweak baryogenesis
• Top Down Electroweak Dipole Operators
• Effective field theory, electric dipole moments and electroweak baryogenesis
• Electroweak Baryogenesis from Temperature-Varying Couplings
• Electroweak baryogenesis via bottom transport
• Electroweak baryogenesis in aligned two Higgs doublet models
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• New benchmark scenarios of electroweak baryogenesis in aligned two Higgs double models
• Probing Electroweak Baryogenesis induced by extra bottom Yukawa coupling via EDMs and collider signatures
• Lepton-mediated electroweak baryogenesis, gravitational waves and the $4\tau$ final state at the collider
• Beyond fast rate approximations: General analytic solutions to coupled transport equations during cosmic phase transitions
• Top Quark Forward-Backward Asymmetry and Anomalous Right-Handed Charge Currents
• Electroweak baryogenesis between broken phases in multi-step phase transition
• Probing Dark Sector CP Violation with Electric Dipole Moments and Colliders