  The combined LEP/SLD data on the b\bar b forward-backward asymmetry from the
Z-pole measurements may imply the presence of new physics in the $Zb\bar b$
couplings. In general, the effect of new physics can be parameterized by
$SU_C(3)\times SU_L(2)\times U_Y(1)$ invariant higher dimensional operators. By
fitting the recently announced LEP/SLD data on A_b and R_b, 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 $b\bar b$ production at LEP II, $t\bar t$
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.
