Data di Pubblicazione:
1997
Abstract:
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(αs) correction to the ρ parameter. 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.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
A. Djouadi; P. Gambino; S. Heinemeyer; W. Hollik; C. Jünger; G. Weiglein
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