$R_b$ in supergravity models

Details $R_b$ in supergravity models $R_b$ in supergravity models

1995-01-10

arxiv.org/abs/hep-ph/9501258v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, LaTeX, 1 figure (included).

Scientific paper

We compute the supersymmetric contribution to $R_{b}\equiv \Gamma (Z\to b{\bar b})/\Gamma (Z\to {\rm hadrons})$ in a variety of supergravity models. We find $R^{\rm susy}_b\lsim0.0004$, which does not shift significantly the Standard Model prediction ($R^{\rm SM}_b=0.2162$ for $m_t=160\GeV$). An improvement in experimental precision by a factor of four would be required to be sensitive to such an effect.

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