Fits of the Electroweak Standard Model and Beyond using Gfitter
arXiv:0810.3664
Abstract
The global fit of the Standard Model to electroweak precision data, routinely performed by the LEP electroweak working groups and others, has been revisited in view of (i) the development of the new generic fitting package, Gfitter, (ii) the insertion of constraints from direct Higgs searches at LEP and Tevatron, and (iii) a more thorough statistical interpretation of the results. This paper describes the Gfitter project, and presents state-of-the-art results for the global electroweak fit in the Standard Model, and for a model with an extended Higgs sector. Example results are an estimation of the mass of the Higgs boson (M_H = 116.4^{+18.3}_{-1.3} GeV) and a forth-order result for the strong coupling strength (alpha_S(M_Z^2) = 0.1193^{+0.0028}_{-0.0027}(exp)+/-0.0001(theo)). Using toy Monte Carlo techniques the p-value of the SM has been determined (p=0.22). As an example of a New Physics model constraints are derived for the Two Higgs Doublet Model of Type-II using observables from the B and K physics sectors.
Talk at ICHEP08, Philadelphia, USA, July 2008; 4 pages, 4 figures
References in corpus (6)
- Hadronic Z- and tau-Decays in Order alpha_s^4
- B -> D tau nu Branching Ratios: Opportunity for Lattice QCD and Hadron Colliders
- Averages of b-hadron Properties at the End of 2005
- Observation of the Semileptonic Decays B --> D* tau nubar and Evidence for B --> D tau nubar
- Combination of CDF and D0 Results on W Boson Mass and Width
- Combined CDF and Dzero Upper Limits on Standard Model Higgs Boson Production at High Mass (155-200 GeV/c2) with 3 fb-1 of data