P. Gambino, PRECISION TESTS OF THE STANDARD MODEL AND HIGHER-ORDER EFFECTS - THE EXAMPLE OF THE EFFECTIVE MIXING ANGLE, ACT PHY P B, 27(12), 1996, pp. 3671-3683
The radiative corrections involved in the precise determination of the
electroweak mixing angle measured at the Z(0) peak are reviewed in de
tail, with particular emphasis on the new calculation of two-loop heav
y top effects. This example serves as a brief pedagogical introduction
to the problems and techniques of higher order electroweak calculatio
ns.