Nonoblique effects in the Zbb-bar vertex from extended technicolor dynamics.

@article{Chivukula1992NonobliqueEI,
  title={Nonoblique effects in the Zbb-bar vertex from extended technicolor dynamics.},
  author={Chivukula and Selipsky and Simmons},
  journal={Physical review letters},
  year={1992},
  volume={69 4},
  pages={
          575-577
        }
}
Extended technicolor theories generate potentially large corrections to the {ital Zb{bar b}} vertex which can be observed in current experiments at the CERN {ital e}{sup +}{ital e{minus}} collider LEP. 
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TLDR
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Weak Interactions and Modern Particle Theory