Revisiting the global electroweak fit of the Standard Model and beyond with Gfitter
By H. Flächer, M. Goebel, J. Haller, Andreas Hoecker, K. Mönig, J. Stelzer, T. Group. 2008
191 citations recorded by the source corpus.
AbstractThe global fit of the Standard Model to electroweak precision data, routinely performed by the LEP electroweak working group and others, demonstrated impressively the predictive power of electroweak unification and quantum loop corrections. We have revisited this fit in view of (i) the development of the new generic fitting package, Gfitter, allowing for flexible and efficient model testing in high-energy physics, (ii) the insertion of constraints from direct Higgs searches at LEP and the Tevatron, and (iii) a more thorough statistical interpretation of the results. Gfitter is a modular fitting toolkit, which features predictive theoretical models as independent plug-ins, and a statistical analysis of the fit results using toy Monte Carlo techniques. The state-of-the-art electroweak Standard Model is fully implemented, as well as generic extensions to it. Theoretical uncertainties are explicitly included in the fit through scale parameters varying within given error ranges.This paper introduces the Gfitter project, and presents state-of-the-art results for the global electroweak fit in the Standard Model (SM), and for a model with an extended Higgs sector (2HDM). Numerical and graphical results for fits with and without including the constraints from the direct Higgs searches at LEP and Tevatron are given. Perspectives for future colliders are analysed and discussed.In the SM fit including the direct Higgs searches, we find MH=116.4−1.3+18.3 GeV, and the 2σ and 3σ allowed regions [114,145] GeV and [[113,168] and [180,225]] GeV, respectively. For the strong coupling strength at fourth perturbative order we obtain αS(MZ2)=0.1193−0.0027+0.0028(exp )±0.0001 (theo). Finally, for the mass of the top quark, excluding the direct measurements, we find mt=178.2−4.2+9.8 GeV. In the 2HDM we exclude a charged-Higgs mass below 240 GeV at 95% confidence level. This limit increases towards larger tan β, e.g., $M_{H^{\pm}}<780\ \mbox{GeV}$ is excluded for tan β=70.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/339cca19b7674888a269ed258688e5328214ba5f
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In Nuclear and High Energy Physics
Citations in the corpus
- A Higgs conundrum with vector fermions (2012, background): “Precision electroweak measurements suggest that a Standard Model Higgs boson must be lighter than ∼ 145 GeV [1, 2] and recent measurements from the LHC exclude a Standard Model Higgs boson in the range 129 GeV < MH < 600 GeV [3].”
- Illuminating dark photons with high-energy colliders (2014, methodology): “In contrast to [41], our approach closely mirrors the procedure performed by the Gfitter group [109], and introduces all observables directly related to properties of the electroweak bosons, including observables that are not corrected at tree level in the dark photon model, such as mW .”