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The \(\gamma \gamma \to \gamma \gamma \) process in the standard and SUSY models at high energies

  • G.J. Gounaris
  • P.I. Porfyriadis
  • F.M. Renard
Theoretical physics

Abstract.

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 \(W\), 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.

Keywords

Parameter Space Simple Expression Helicity Amplitude SUSY Model Supersymmetric Partner 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • G.J. Gounaris
    • 1
  • P.I. Porfyriadis
    • 1
  • F.M. Renard
    • 2
  1. 1. Department of Theoretical Physics, University of Thessaloniki, GR-54006, Thessaloniki, Greece GR
  2. 2. Physique Mathématique et Théorique, UMR 5825 Université Montpellier II, F-34095 Montpellier Cedex 5, France FR

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