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**1 - 3**of**3**### Prepared for submission to JHEP Constraints on the Universal Varying Yukawa Couplings: from SM-like to Fermiophobic

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### Prepared for submission to JHEP Higgs phenomenology in the Stealth Doublet Model

"... We analyze a model for the Higgs sector with two scalar doublets and a softly broken Z2 symmetry. One of the doublets breaks the electroweak symmetry and has tree-level Yukawa couplings to fermions. The other doublet has no vacuum expectation value and no tree-level couplings to fermions. Because th ..."

Abstract
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We analyze a model for the Higgs sector with two scalar doublets and a softly broken Z2 symmetry. One of the doublets breaks the electroweak symmetry and has tree-level Yukawa couplings to fermions. The other doublet has no vacuum expectation value and no tree-level couplings to fermions. Because the Z2 parity is broken the two doublets can mix, which leads to a distinct and novel phenomenology. This Stealth Doublet Model can be seen as a generalization of the Inert Doublet Model with a broken Z2 symmetry. We outline the model and present constraints from theory, electroweak precision tests and collider searches, including the recent observation of a Higgs boson at the LHC. The CP-odd scalar A and the charged scalar H ± couple to fermions at one-loop level. We compute the decays of A and H ± and in particular the one-loop decays A → ff ̄ , H ± → ff ̄ ′, H ± → W±Z and H ± →W±γ. We also describe how to calculate and renormalize such processes in our model. We find that if one of H ± or A is the lightest scalar, H ± → W±γ or A → bb ̄ are typically their respective dominating decay channels. Otherwise, the dominating decays of H ± and A are into a scalar and a vector. Due to the absence of tree-level fermion couplings for H ± and A, we consider pair production and associated production with vector bosons and scalars at the LHC. If the parameter space of the model that favors H ± → W±γ is realized in Nature, we estimate that there should be a considerable amount of such events in the present LHC data. ar