Electroweak Baryogenesis in a Scalar-Assisted Vector-Like Fermion Model

Abstract

We extend the standard model to a scalar-assisted vector-like fermion model to realize electroweak baryogenesis. The extended Cabbibo-Kobayashi-Maskawa matrix, due to the mixing among the vector-like quark and the standard model quarks, provides additional sources of the CP violation. Together with the enhancement from large vector-like quark mass, a large enough baryon-to-photon ratio could be obtained. The strongly first-order phase transition could be realized via the potential barrier which separate the broken minimum and the symmetric minimum in the scalar potential. We investigate in detail the one-loop temperature-dependent effective potential, and perform a random parameter scan to study the allowed parameter region that satisfies the strongly first order phase transition criteria $v_c\ge T_c$. Several distinct patterns of phase transition are classified and discussed. Among these patterns, large trilinear mass term between the Higgs boson and the scalar is preferred, for it controls the width of the potential barrier. Our results indicate large quartic scalar couplings, and moderate mixing angle between the Higgs boson and the new scalar. This parameter region could be further explored at the Run 2 LHC.

40 pages, 18 figures, v2: revised version with references updated, and minor revision

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Cited by in corpus (7)

• Non-resonant Collider Signatures of a Singlet-Driven Electroweak Phase Transition
• Benchmarks for Double Higgs Production in the Singlet Extended Standard Model at the LHC
• Exotic Higgs Decays and the Electroweak Phase Transition
• Electroweak baryogenesis from a dark sector
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• Electroweak phase transitions in multi-Higgs models: the case of Trinification-inspired THDSM
• Radiative decays of a singlet scalar boson through vector-like quarks