Abstract
Abstract We analyze the 2011 LHC and Tevatron Higgs data in the context of simplified new physics models addressing the naturalness problem. These models are expected to contain new particles with sizable couplings to the Higgs boson, which can easily modify the Higgs production cross sections and branching fractions. We focus on searches in the h → ZZ ∗ → 4 l, h → WW ∗ → lνlν, h → γγ, hjj → γγjj and $ hV \to b\overline b V $ channels. Combining the available ATLAS, CMS, and Tevatron data in these channels, we derive constraints on an effective low-energy theory of the Higgs boson. We then map several simplified scenarios to the effective theory, capturing numerous natural new physics models such as supersymmetry and Little Higgs, and extract the constraints on the corresponding parameter space. We show that simple models where one fermionic or one scalar partner is responsible for stabilizing the Higgs potential are already constrained in a non-trivial way by LHC and Tevatron Higgs data.
Highlights
Rate: the dominant production mode via gluon fusion is a one loop process in the SM and is sensitive to new physics containing, as in typical natural models, light new colored states coupled to the Higgs
We show that simple models where one fermionic or one scalar partner is responsible for stabilizing the Higgs potential are already constrained in a non-trivial way by LHC and Tevatron Higgs data
While several Higgs production and decay modes may change in the presence of new particles, the correlated change in different channel may crucially depend on the new physics scenario
Summary
We begin by defining a convenient framework to describe LHC and Tevatron Higgs phenomenology. We define an effective theory at the scale μ ∼ mh, which describes the couplings of a single Higgs boson, h, to the SM gauge bosons and fermions. The 1-loop contribution to cg from an additional fermion in the fundyfahmfe/n√ta2l representation is given of SU(3)C and coupled by eq (2.2) with ct →. The Higgs production mechanism in the first three channels is dominated by the gluon fusion process which scales as c2g. Where |Ctot|2 = Γtot/ΓStoMt. The approximation holds assuming the Higgs production remains dominated by the gluon fusion subprocess. 1/3 that of the VBF production mode to the 2γ2j final state studied by CMS [8, 9], but it may become more important in models where the gluon fusion cross section is enhanced relative to the VBF one.
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