Supersymmetric Contributions to Electroweak Precision Observables: QCD Corrections
- Physique Mathematique et Theorique, Universite de Montpellier II, F-34095 Montpellier Cedex 5 (France)
- Institut fuer Theoretische Physik, Universitaet Karlsruhe, D-76128 Karlsruhe (Germany)
- Max-Planck Institut fuer Physik, Werner Heisenberg Institut, D-80805 Munich (Germany)
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 (SM) and derive the associated O({alpha}{sub s}) correction to the {rho} parameter. The two-loop corrections modify the one-loop contribution by up to 30{percent} 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. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 496823
- Journal Information:
- Physical Review Letters, Vol. 78, Issue 19; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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