Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-12-14
Phys.Rev.Lett.78:3626-3629,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, LaTeX, 5 ps-figures. The paper is also available via www at http://www-itp.physik.uni-karlsruhe.de/prep/prep96/prepl
Scientific paper
10.1103/PhysRevLett.78.3626
We calculate the two-loop QCD correction to the scalar quark contributions to the electroweak gauge-boson self-energies at zero momentum-transfer in the supersymmetric extension of the Standard Model. We then derive the $O(\alpha_s)$ correction to the contribution of the scalar top and bottom quark loops to the rho parameter, which is the most sizable supersymmetric contribution to the electroweak mixing angle and the W-boson mass. The two-loop corrections modify the one-loop contribution by up to 30%; the gluino decouples for large masses. Contrary to the SM case where the QCD corrections are negative and screen the one-loop value, the corresponding corrections in the supersymmetric case are in general positive, increasing the sensitivity in the search for scalar quarks through their virtual effects in high-precision electroweak observables.
Djouadi Abdelhak
Gambino Paolo
Heinemeyer Sven
Hollik Wolfgang
Junger C.
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