Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-10-22
Phys.Rev.D57:4179-4196,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages, LaTex, 12 figures and two tables included. Complete ps-file also available via WWW at http://www-itp.physik.uni-ka
Scientific paper
10.1103/PhysRevD.57.4179
In the supersymmetric extension of the Standard Model we derive the two-loop QCD corrections to the scalar quark contributions to the electroweak precision observables entering via the rho parameter. A very compact expression is derived for the gluon-exchange contribution. The complete analytic result for the gluino-exchange contribution is very lengthy; we give expressions for several limiting cases that were derived from the general result. The two-loop corrections, generally of the order of 10 to 30% of the one-loop contributions, canbe very significant. Contrary to the Standard Model case, where the QCD corrections are negative and screen the one-loop value, the corresponding corrections in the supersymmetric case are in general positive, therefore 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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