Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-11-26
Nucl.Phys. B548 (1999) 3-59
Physics
High Energy Physics
High Energy Physics - Phenomenology
59 pages, LaTeX2e (uses axodraw.sty), 16 figures
Scientific paper
10.1016/S0550-3213(99)00110-8
Radiative corrections to processes that involve the production and subsequent decay of unstable particles are complex due to various theoretical and practical problems. The so-called double-pole approximation offers a way out of these problems. This method is applied to the reaction $e^{+}e^{-} \to W^{+}W^{-} \to 4 $fermions, which allows us to address all the key issues of dealing with unstable particles, like gauge invariance, interactions between different stages of the reaction, and overlapping resonances. Within the double-pole approximation the complete $\OO(\alpha)$ electroweak corrections are evaluated for this off-shell $W$-pair production process. Examples of the effect of these corrections on a number of distributions are presented. These comprise mass and angular distributions as well as the photon-energy spectrum.
Beenakker Wim
Berends F. A.
Chapovsky A. P.
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