The \gamma \gamma \to \gamma \gamma process in the standard and SUSY models at high energies |
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Authors: | GJ Gounaris PI Porfyriadis FM Renard |
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Institution: | (1) Department of Theoretical Physics, University of Thessaloniki, GR-54006, Thessaloniki, Greece , GR;(2) Physique Mathématique et Théorique, UMR 5825 Université Montpellier II, F-34095 Montpellier Cedex 5, France , FR |
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Abstract: | We study the helicity amplitudes of the process 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 , 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;
there, they interfere most effectively with the primarily imaginary SM amplitudes. Simple expressions for the relevant one-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.
Received: 3 February 1999 / Pulished online: 30 June 1999 |
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Keywords: | |
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