Implications of LEP/SLD Data for New Physics in Zbbbar Couplings
Abstract
The combined LEP/SLD data on the b b forward-backward asymmetry from the Z-pole measurements may imply the presence of new physics in the Zb b couplings. In general, the effect of new physics can be parameterized by SUC(3)× SUL(2)× UY(1) invariant higher dimensional operators. By fitting the recently announced LEP/SLD data on Ab and Rb, the size of the coupling strengths of these operators can be determined. We also found that the new physics operators can be divided into two types, depending on their Higgs field content. The ones involving the Higgs have very mild effects at higher energy colliders, while the other type which do not contain the Higgs field can show significantly large effects on b b production at LEP II, t t production at the NLC and single top production at the Tevatron. The preliminary data from the LEP II measurements disfavors the second type of operators.
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