Production of light fermion-antifermion pairs in gamma gamma collisions

Citation
A. Denne et S. Dittmaier, Production of light fermion-antifermion pairs in gamma gamma collisions, EUR PHY J C, 9(3), 1999, pp. 425-435
Citations number
33
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
1434-6044 → ACNP
Volume
9
Issue
3
Year of publication
1999
Pages
425 - 435
Database
ISI
SICI code
1434-6044(199907)9:3<425:POLFPI>2.0.ZU;2-Y
Abstract
The O(alpha) corrections to gamma gamma --> f (f) over bar in the standard model are calculated for arbitrary light fermions f. The relevant analytica l results are listed in a form that is appropriate for practical applicatio ns, 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(+) ar e negligible below the electroweak scale, reach the percent level at a few hundred GeV, and grow to about -10% at 2 TeV. The weak corrections to u (u) over bar and d (d) over bar production have a shape similar to the one for e(-)e(+) but they are larger by factors of about 1.4 and 3, respectively.