# $R b$ in supersymmetric models

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We compute the supersymmetric contribution to $R {b}\equiv \Gamma (Z\to b{\bar b})-\Gamma (Z\to { m hadrons})$ in a variety of supersymmetric models. In the context of supergravity models with universal soft-supersymmetry-breaking and radiative electroweak breaking we find $R^{ m susy} b\lsim0.0004$, which does not shift significantly the Standard

Author: X. Wang; J. Lopez; D. Nanopoulos

Source: https://archive.org/