Standard Model Higgs Searches at CDF and DØ

Abstract

In the framework of the Standard Model, fermions and gauge bosons acquire mass through the Higgs mechanism [1]. This mechanism requires a new spin-0 boson (the Higgs boson) whose existence is the most important prediction of the Standard Model which has not been verified by experiments yet. Its mass is not predicted by the theory, but an upper limit can be placed by fit on precise electroweak measurements [2]. Considering CDF and DØ combined top mass measurement M _top = 170.9±1.8GeV/c ² [3] and CDF W mass measurement M _W = 80.398±0.0025, as well as other precision measurements from SLD and LEP, the upper limit on Higgs mass at 95% CL is 144GeV/c ² (Fig. 1). This limit increases to 182 GeV/c ² if we include the 114 GeV/c ² exclusion limit by direct searches at LEP [4].