Abstract
We present an update of the global fit of the Standard Model electroweak sector to latest experimental results. We include new kinematic top quark and W boson mass measurements from the LHC, a sin !^2theta ^{ell }_{mathrm{eff}} result from the Tevatron, and a new evaluation of the hadronic contribution to alpha (M_Z^2). We present tests of the internal consistency of the electroweak Standard Model and updated numerical predictions of key observables. The electroweak data combined with measurements of the Higgs boson coupling strengths and flavour physics observables are used to constrain parameters of two-Higgs-doublet models.
Highlights
Gfitter incl. direct searches collaboration [24], new combined results of the top quark mass by the LHC experiments [15,21], a new combination of measurements of the effective leptonic electroweak mixing angles from the Tevatron experiments [25], a Higgs boson mass combination released by the ATLAS and CMS collaborations [18], and an updated value of the hadronic contribution to the running of the electromagnetic coupling strength at the Z boson mass [26]
In the first part of this paper we present an update of the electroweak fit including these new experimental results and up-to-date theoretical predictions
Two-Higgs-doublet models (2HDM) [27] are a popular SM extension in which an additional SU (2)L × U (1)Y scalar doublet field with hypercharge Y = 1 is added to the SM leading to the existence of five physical Higgs boson states, h, H, A, H +, and H −, where the neutral h may be identified with the discovered 125 GeV Higgs boson as is assumed in this paper
Summary
Collaboration [24], new combined results of the top quark mass by the LHC experiments [15,21], a new combination of measurements of the effective leptonic electroweak mixing angles from the Tevatron experiments [25], a Higgs boson mass combination released by the ATLAS and CMS collaborations [18], and an updated value of the hadronic contribution to the running of the electromagnetic coupling strength at the Z boson mass [26]. No experimental hint for additional scalar states has been observed so far in direct searches [28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44]. In this situation global 2HDM fits, exploiting observables sensitive to these additional Higgs boson states via quantum corrections, can be used to constrain the allowed mass ranges and 2HDM mixing parameters. In the second part of this article such constraints are derived from a global fit using a combination of electroweak precision data, flavour physics observables, the anomalous magnetic moment of the muon, and measurements of the Higgs boson coupling strength to SM particles
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