Dynamical O(alpha_s) Effects in Forward-Backward Asymmetries of Heavy Quarks

We examine the O(�) forward-backward asymmetries for the production process e + e → ,Z → q¯ q(g), tagging the outgoing heavy-quark jet at center-of-momentum energies off the Z-peak. The complicated analytic results are reduced to simple polynomial forms that provide excellent approximations. For charm and bottom quark, a full dynamical cancellation gives O(�) zeros in the forward-backward asymmetry close to the Z-peak. We conclude with a detailed numerical analysis of our results.