Supersymmetric Hints from Precision Electroweak Data?
  The Standard Model does not provide a very good fit to the most recent precision electroweak data from LEP, due primarily to the observed branching ratios for $Z$ decay to $b\bar b$ and $c\bar c$. The possibility that an extension of the Standard Model with low-energy supersymmetry can improve the agreement between data and theory is considered. 
Howard E. Haber