Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-12-17
Eur.Phys.J.C9:425-435,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, latex, 7 postscript figures
Scientific paper
10.1007/s100529900049
The $O(\alpha)$ corrections to $\gamma\gamma --> f \bar f$ in the Standard Model are calculated for arbitrary, light fermions $f$. The relevant analytical results are listed in a form that is appropriate for practical applications, and numerical results for integrated cross sections are discussed. The corresponding QED corrections are generally of the order of some per mille for arbitrary energies. The weak corrections to $\gamma\gamma --> e^-e^+$ are negligible below the electroweak scale, reach the per-cent level at a few hundred GeV and grow to about -10% at 2TeV. The weak corrections to $u \bar u$ and $d \bar d$ production have a shape similar to the one for $e^-e^+$, but they are larger by factors $\sim 1.4$ and $\sim 3$, respectively.
Denner Ansgar
Dittmaier Stefan
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