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The global fit of the Standard Model to electroweak precision data, routinelyperformed by the LEP electroweak working groups and others, has been revisitedin view of (i) the development of the new generic fitting package, Gfitter,(ii) the insertion of constraints from direct Higgs searches at LEP andTevatron, and (iii) a more thorough statistical interpretation of the results.This paper describes the Gfitter project, and presents state-of-the-art resultsfor the global electroweak fit in the Standard Model, and for a model with anextended Higgs sector. Example results are an estimation of the mass of theHiggs boson (M_H = 116.4^{+18.3}_{-1.3} GeV) and a forth-order result for thestrong coupling strength (alpha_S(M_Z^2) =0.1193^{+0.0028}_{-0.0027}(exp)+/-0.0001(theo)). Using toy Monte Carlotechniques the p-value of the SM has been determined (p=0.22). As an example ofa New Physics model constraints are derived for the Two Higgs Doublet Model ofType-II using observables from the B and K physics sectors.

Fits of the Electroweak Standard Model and Beyond using Gfitter