Leading QCD Corrections to Scalar Quark Contributions to Electroweak Precision Observables
arXiv:hep-ph/9710438 · doi:10.1103/PhysRevD.57.4179
Abstract
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.
33 pages, LaTex, 12 figures and two tables included. Complete ps-file also available via WWW at http://www-itp.physik.uni-karlsruhe.de/prep/prep.html
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