The gamma gamma to gamma gamma process in the Standard and SUSY models at high energies

Details The gamma gamma to gamma gamma process in the Standard and SUSY models at high energies The gamma gamma to gamma gamma process in the Standard and SUSY models at high energies

1999-02-03

arxiv.org/abs/hep-ph/9902230v1

Eur.Phys.J.C9:673-686,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages and 7 figures

Scientific paper

10.1007/s100529900079

We study the helicity amplitudes of the process \gamma \gamma \to \gamma \gamma at high energy, which in the standard and SUSY models first arise at the one-loop order. In the standard model (SM), the diagrams involve W and charged quark and lepton loops, while in SUSY we also have contributions from chargino, charged sfermion and Higgs loop diagrams. The SUSY contributions are most important in the region above the threshold for producing the supersymmetric partners; since there, they interfere most effectively with the primarily imaginary SM amplitudes. Simple expressions for the relevant 1-loop functions are given, which provide a direct overview of the behaviour of the helicity amplitudes in the whole parameter space at high energies. The various characteristics of a large set of observables are studied in detail.

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