2017 Impact factor 5.172
Particles and Fields
Eur. Phys. J. C 9, 425-435
DOI 10.1007/s100529900049

Production of light fermion-antifermion pairs in $\gamma\gamma$collisions

A. Denner1 - S. Dittmaier2

1 Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
2 Theory Division, CERN, CH-1211 Geneva 23, Switzerland

Received: 18 December 1998 / Revised version: 1 March 1999 / Published online: 18 June 1999

The ${\cal O}(\alpha)$ corrections to $\gamma\gamma\to f{\bar f}$ 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 $\gamma\gamma\to\mathsf{e^-}\mathsf{e^+}$ are negligible below the electroweak scale, reach the percent level at a few hundred GeV, and grow to about $-10\%$ at $2\mathsf{TeV}$. The weak corrections to $\mathsf{u}\bar\mathsf{u}$ and $\mathsf{d}\bar\mathsf{d}$ production have a shape similar to the one for $\mathsf{e^-}\mathsf{e^+}$, but they are larger by factors of about 1.4 and 3, respectively.

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