Validity of two Higgs doublet models with a scalar color octet up to a high energy scale

Abstract

We have recently studied theoretical constraints on the parameters of a 2HDM augmented with a color-octet scalar. In this paper we consider the consequences of requiring the model to remain valid up to very high energy scales, such as the GUT scale. The acceptable region of parameter space is reduced when one insists on vacuum stability, perturbative unitarity and the absence of Landau poles below a given scale. As the scale to which we require the model to be valid is increased, the acceptable region of parameter space for the 2HDM sector is reduced in such a way that it approaches the alignment limit, $\cos (\beta -\alpha )\to 0$, and the masses of $H^0$, $A$ and $H^{\pm }$ are pushed closer to each other. The parameters of the color octet sector are also restricted to an increasingly smaller region.

16 pages, 5 figures; referenced added; typos fixed

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• Flavor Changing Neutral Currents, an Extended Scalar Sector, and the Higgs Production Rate at the LHC
• A Twisted Custodial Symmetry in the Two-Higgs-Doublet Model
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• Color Octet Scalar Production at the LHC
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Cited by in corpus (5)

• New theoretical constraints on scalar color octet models
• NLO Perturbativity Bounds on Quartic Couplings in Renormalizable Theories with ${\varphi }^4$-like Scalar Sectors
• Color-octet scalar decays to a gluon and an electroweak gauge boson in the Manohar-Wise model
• Fingerprinting the contribution of colored scalars to the $H^{+}{W}^{-}Z(\gamma )$ vertex
• Searching for top-philic heavy resonances in boosted four-top final states