Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-11-09
Acta Phys.Polon. B27 (1996) 2507-2524
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, latex, 6 uuencoded postscript figures, talk presented by G. Weiglein at The Second German-Polish Symposium, New Idea
Scientific paper
The nature of the electroweak bosonic loop corrections to which current precision experiments are sensitive is explored. The set of effective parameters $\De x$, $\De y$, and $\eps$, which quantify SU(2) violation in an effective Lagrangian, is shown to be particularly useful for this purpose. The standard bosonic corrections are sizable only in the parameter $\De y$, while $\De x$ and $\eps$ are sufficiently well approximated by the pure fermion-loop prediction. By analyzing the contributions to $\De y$ it is shown that the bosonic loop corrections resolved by the present precision data are induced by the change in energy scale between the low-energy process muon decay and the energy scale of the LEP1 observables. If the (theoretical value of the) leptonic width of the W boson is used as input parameter instead of the Fermi constant $\GF$, no further bosonic loop corrections are necessary for compatibility between theory and experiment.
Dittmaier Stefan
Schildknecht Dieter
Weiglein Georg
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