Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-07-10
Z.Phys.C75:627-640,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
42 pages
Scientific paper
10.1007/s002880050508
The Minimal supersymmetric extension of the Standard Model (MSSM) with light stops, charginos or pseudoscalar Higgs bosons has been suggested as an explanation of the too high value of the branching ratio of the Z0 boson into b quarks (Rb anomaly). A program including all radiative corrections to the MSSM at the same level as the radiative corrections to the SM has been developed and used to perform global fits to all electroweak data from LEP, SLC and the Tevatron. The probability of the global fit improves from 8% in the SM to 18% in the MSSM. Including the b->s gamma rate, as measured by CLEO, reduces the probability from 18% to 15%. In the constrained MSSM requiring unification and electroweak symmetry breaking no improvement of Rb is possible.
Boer Wim de
Dabelstein Andreas
Hollik Wolfgang
Moesle W.
Schwickerath Ulrich
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