Updated status of the global electroweak fit and constraints on new physics

By M. Baak, M. Goebel, J. Haller, Andreas Hoecker, D. Kennedy, K. Mönig, M. Schott, J. Stelzer, T. Group. 2011

270 citations recorded by the source corpus.

We present an update of the Standard Model fit to electroweak precision data. We include newest experimental results on the top-quark mass, the W mass and width, and the Higgs-boson mass bounds from LEP, Tevatron and the LHC. We also include a new determination of the electromagnetic coupling strength at the Z pole. We find for the Higgs-boson mass $91^{+30}_{-23}~\mbox{GeV}$ and $120^{+12}_{-5}~\mbox{GeV}$ when not including and including the direct Higgs searches, respectively. From the latter fit we indirectly determine the W mass to be $(80.360^{+0.014}_{-0.013})~\mbox{GeV}$. We exploit the data to determine experimental constraints on the oblique vacuum polarisation parameters, and confront these with predictions from the Standard Model (SM) and selected SM extensions. By fitting the oblique parameters to the electroweak data we derive allowed regions in the BSM parameter spaces. We revisit and consistently update these constraints for a fourth fermion generation, two Higgs doublet, inert Higgs and littlest Higgs models, models with large, universal or warped extra dimensions and technicolour. In most of the models studied a heavy Higgs boson can be made compatible with the electroweak precision data.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/dd16e3e0901e53efba67d15689f85b91fec14f4a

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Citations in the corpus

Doubling down on naturalness with a supersymmetric twin Higgs (2013, unknown): “, [40]), in the limit m(2)A λ(2)f (2), the leading contributions to S and T from the (H2, A2, H± 2 ) sector are parametrically of order ∆S ≈ 1 16π λ(2)v(2) m(2)A ∆T ≈ 1 48π λ(2) g(2)s(2)W λ(2)f 2 m(2)A .”
Dark Matter through the Higgs portal (2019, methodology): “A global fit to all electroweak precision observables available today has been made leading to the following χ(2) [341,342] χ(2) = ∑”
Dark matter in the inert doublet model after the discovery of a Higgs-like boson at the LHC (2013, background): “For the case of U = 0, recent experimental limits on the remaining two parameters are [60]”
Update of the global electroweak fit and constraints on two-Higgs-doublet models (2018, methodology): “For a detailed discussion of the experimental data, the implementation of the theoretical predictions, and the statistical procedure employed by Gfitter we refer the reader to our previous publications [9,22,23,45].”
Higgs Physics at the HL-LHC and HE-LHC (2019, methodology): “Constraints from EW precision data [1017, 1018] also apply with the primary effect being that the neutral and charged”