Abstract
Simplified models provide a useful tool to conduct the search and exploration of physics beyond the Standard Model in a model-independent fashion. In this work we consider the complementarity of indirect searches for new physics in Higgs couplings and distributions with direct searches for new particles, using a simplified model which includes a new singlet scalar resonance and vector-like fermions that can mix with the SM top-quark. We fit this model to the combined ATLAS and CMS 125 GeV Higgs production and coupling measurements and other precision electroweak constraints, and explore in detail the effects of the new matter content upon Higgs production and kinematics. We highlight some novel features and decay modes of the top partner phenomenology, and discuss prospects for Run II.
Highlights
(SM) measurements such as the properties of the Higgs boson
In this work we consider the complementarity of indirect searches for new physics in Higgs couplings and distributions with direct searches for new particles, using a simplified model which includes a new singlet scalar resonance and vector-like fermions that can mix with the SM topquark
We have formulated a set of simplified models to characterize the interactions of physics beyond the Standard Model with the 125 GeV Higgs boson
Summary
In constructing a first simplified model for Higgs physics, we examine a scenario with minimal particle content and interactions that influences the 125 GeV Higgs couplings in a calculable manner. We quote the most general form of the scalar potential and do not assume a Z2 symmetry for the scalar field S to simplify the potential, as this would eliminate the ST T coupling to the vector-like quark in LYukawa, see eq (2.4). We take the free parameters to be the physics masses of the heavy scalar and top-quark partner, the mixing angles θ in the scalar, and θL in the fermion sector, respectively, and the vacuum expectation value of the singlet field vS, with the fixed parameters being the mass and vev of the SM-like Higgs as well as the top-quark mass: mh , θ, vS, mT and θL; mh1 = 125.0 GeV, vH = 246 GeV, mt = 173.2 GeV. The free parameters of our simplified model are constrained by perturbative unitarity and electroweak precision data, as well as the Higgs cross sections and branching ratios as we will see below
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