The Standard Model

Results of direct searches for neutral, supersymmetric Higgs bosons at the LEP, in the case of maximum CP symmetry violation in the Higgs sector. The area of tested parameters is shown according to the mass of the lightest neutral boson, mH1, and tan(beta), parameter of the model.

Experiments using accelerators at the highest accessible energy can be used to perform precise tests on the Standard Model. At CERN, the LEP has obtained many results leading to more precise knowledge in this field. The degree of precision attained in measuring the mass of the W boson has been exploited to obtain an indirect upper bound for the mass of the Higgs boson through quantum corrections. The Tevatron accelerator at Fermilab (near Chicago) has yielded results on the physics and mass of the top quark. The HERA collider at the DESY research centre in Hamburg has obtained more precise measurements of inclusive cross sections, related to parton (i.e. quark and gluon) densities in the proton, offering vital physics data for the LHC. All these experiments have also included an extensive search for possible deviations from the Standard Model.


Last update : 10/18 2005 (598)


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