CP violation in the extension of SM with a complex singlet scalar and vector quarks

Abstract

We consider the simplest extension of the SM with a complex singlet and a pair of heavy doublet vector quarks, the so-called cSMCS model. In this model, the CP violation can emerge spontaneously as a consequence of the time-dependent phase of the complex singlet vacuum expectation value and the mass mixing of the SM and heavy vector quarks. In our model, the CP-violating time-dependent phase depends on the Higgs field within the bubble-wall via the Higgs-singlet coupling that can directly explain the observed baryon-to-entropy ratio $\sim 9\times 10^{-11}$. Additionally, as a result of the mixing between vector quarks and SM quarks, the tree level Flavour Changing Neutral Currents and the charged-current decay channels $t^{\prime }\to Wb,Zt,h_{i}t$ and $b^{\prime }\to Wt,Zb,h_{i}b$ would arise that are well constrained by experimental data. We investigate the implications of these constraints on the total cross-section for the production of heavy vector quark pairs via $pp\to t^{\prime }\overline{t^{\prime }}$ and $pp\to b^{\prime }\overline{b^{\prime }}$ channels and obtain the bounds on the heavy quark masses for this model. Accordingly, we show the contribution of these heavy quarks in the Higgs bosons signal strength, ${\mathcal{R}}_{\gamma \gamma }$, as well as corrections to the gauge boson propagators.

25 pages and 8 figures, matches NPB published version

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Cited by in corpus (3)

• High scale boundary conditions with an additional complex singlet
• A Simple Model of Dark Matter and CP Violation
• Restricting the parameter space of Type-II Two Higgs Doublet Models with CP violation