The importance of two-loop top corrections of \gmud\ is discussed. It is shown that in the case of the ratio neutral-to-charged current amplitudes at zero momentum transfer these terms are numerically comparable to the \gmuq\ contribution. An estimate of the theoretical error due to unknown two-loop top effect for few LEP observable is derived through a na\"\i ve extrapolation of this result.
Degrassi, G. (1995). Two-loop electroweak top corrections. In Perspectives for Electroweak Interactions in e+ e- Collisions (pp.67-77). World Scientific.
Two-loop electroweak top corrections
DEGRASSI, GIUSEPPE
1995-01-01
Abstract
The importance of two-loop top corrections of \gmud\ is discussed. It is shown that in the case of the ratio neutral-to-charged current amplitudes at zero momentum transfer these terms are numerically comparable to the \gmuq\ contribution. An estimate of the theoretical error due to unknown two-loop top effect for few LEP observable is derived through a na\"\i ve extrapolation of this result.File in questo prodotto:
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