The \gamma \gamma \to Z Z process and the search for virtual SUSY effects at a \gamma \gamma Collider |
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Authors: | GJ Gounaris J Layssac PI Porfyriadis FM Renard |
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Institution: | (1) Department of Theoretical Physics, Aristotle University of Thessaloniki, 54006, Thessaloniki, Greece, GR;(2) Physique Mathématique et Théorique, UMR 5825, Université Montpellier II, 34095 Montpellier Cedex 5, FR |
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Abstract: | We study the helicity amplitudes of the process in the Standard Model at high energy. These amplitudes receive contributions from the W and charged quark and lepton loops, analogous to those encountered in the cases studied before. But also receives contributions from the Higgs s-channel poles involving the effective Higgs- vertex. At energies , the amplitudes in all three processes are mainly helicity-conserving and almost purely imaginary; which renders them a very
useful tool in searching for New Physics. As an example, a SUSY case is studied, and the signatures due to the virtual effects
induced by a chargino-, charged slepton- or a lightest stop-loop in , are explored. These signatures, combined with the analogous ones in and , should help identifying the nature of possible New Physics particles.
Received: 3 September 1999 / Published online: 3 February 2000 |
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