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- W2133908081 abstract "We compute the supersymmetric contribution to $R_{b}equiv Gamma (Zto b{bar b})/Gamma (Zto {rm hadrons})$ in a variety of supersymmetric models. In the context of supergravity models with universal soft-supersymmetry-breaking and radiative electroweak breaking we find $R^{rm susy}_blsim0.0004$, which does not shift significantly the Standard Model prediction ($R^{rm SM}_b=0.2157$ for $m_t=175GeV$; $R^{rm exp}_b=0.2204pm0.0020$). We also compute $R_b$ in the minimal supersymmetric standard model (MSSM), and delineate the region of parameter space which yields interestingly large values of $R_b$. This region entails light charginos and top-squarks, but is {em strongly} restricted by the {em combined} constraints from $B(bto sgamma)$ and a not-too-large invisible top-quark branching ratio: only a few percent of the points with $R^{rm susy}_b>0.0020,(1sigma)$ are allowed." @default.
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- W2133908081 date "1995-10-01" @default.
- W2133908081 modified "2023-10-16" @default.
- W2133908081 title "Rbin supersymmetric models" @default.
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- W2133908081 doi "https://doi.org/10.1103/physrevd.52.4116" @default.
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