The ${\alpha }_s^3$ Corrections to the Effective Neutral Current and to the Z Decay Rate in the Heavy Top Quark Limit

K. G. Chetyrkin, O. V. Tarasov

We find the effective neutral current in the heavy top quark limit up to and including the terms of order ${\alpha }_s^3$. The result is then employed to compute the correction of the same…