Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-02-23
Nucl.Phys.B427:53-80,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages + 2 tables in LaTeX, UAB-FT-323. 8 figures available upon request (abraham@ifae.es) in tarsified, compressed and uuen
Scientific paper
10.1016/0550-3213(94)90269-0
Within the framework of the MSSM, we compute the electroweak one-loop supersymmetric quantum corrections to the width $\Gamma (t\rightarrow W^{+}\, b)$ of the canonical main decay of the top quark. The results are presented in two on-shell renormalization schemes parametrized either by $\alpha$ or $G_F$. While in the standard model, and in the Higgs sector of the MSSM, the electroweak radiative corrections in the $G_F$-scheme are rather insensitive to the top quark mass and are of order of $1\%$ at most, the rest (``genuine'' part) of the supersymmetric quantum effects in the MSSM amount to a non-negligible correction that could be about one order of magnitude larger, depending on the top quark mass and of the region of the supersymmetric parameter space. These new electroweak effects, therefore, could be of the same order (and go in the same direction) as the conventional leading QCD corrections.
Garcia David
Hollik Wolfgang
Jimenez Ricardo A.
Sola Joan
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