$R_b$ in supergravity models

X. Wang; J. Lopez; D. Nanopoulos

$R_b$ in supergravity models

高能物理 - 唯象学 2016-09-01 v1

作者: X. Wang , J. Lopez , D. Nanopoulos

摘要

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.

引用

@article{arxiv.hep-ph/9501258,
  title  = {$R_b$ in supergravity models},
  author = {X. Wang and J. Lopez and D. Nanopoulos},
  journal= {arXiv preprint arXiv:hep-ph/9501258},
  year   = {2016}
}

备注

5 pages, LaTeX, 1 figure (included).

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