Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-06-27
Physics
High Energy Physics
High Energy Physics - Phenomenology
110+5 pages, LaTeX2e, 56 figures included. Uses cite.sty, feynmp.sty. PhD Thesis at the Universitat Autonoma de Barcelona. Mai
Scientific paper
In this Thesis we have investigated some effects appearing in top quark observables in the framework of the Minimal Supersymmetric Standard Model (MSSM). We have computed the radiative corrections to some top quark observables, using the on-shell renormalization scheme, and with a physically motivated definition of the tan(beta) parameter. Introductory chapters deal with the MSSM, its renormalization, and the on-shell prescription. In the next chapters we have computed the SUSY-EW corrections (and some SUSY-QCD corrections) to: the non-standard top quark decay partial width \Gamma(t->H+ b); the FCNC top quark decay width \Gamma(t-> c h) (h=h^0,H^0,A^0); and the non-standard top quark production through sbottom decays \Gamma(sbottom -> t \chi^-). We have investigated the consequences of the corrections to \Gamma(t->H^+ b) in the interpretation of the present Tevatron data. Our general conclusion is that the supersymmetric strong and electroweak radiative corrections can be very important in the top/bottom-Higgs super-sector of the MSSM. Therefore, it is necessary to account for these corrections in the theoretical computation of the high energy physics observables, otherwise highly significant information on the potentially underlying SUSY dynamics could be missed. This is true, not only for the future experiments at the LHC and the LC, but also for the present Run I data (and the Run II data around the corner) at the Fermilab Tevatron collider.
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