Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-11-16
Phys.Lett. B475 (2000) 157-167
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, 3 tables and 4 figures. e-mail: renard@lpm.univ-montp2.fr
Scientific paper
10.1016/S0370-2693(00)00074-5
We consider lepton-antilepton annihilation into a fermion-antifermion pair at variable c.m. energy. We propose for this process a simple parametrization of the virtual effects of the most general model of new physics of \underline{universal} type. This parametrization is based on a recent approach, that uses the experimental results of LEP1, SLC as theoretical input. It introduces \underline{three} functions whose energy dependence is argued to be smooth and, in first approximation, negligible. A couple of representative models of new physics are considered, as a support of the previous claim. Explicit bounds are then derived for this type of new physics from the available LEP2 data, and a discussion is given of the relevance in this respect of the different experimental measurements. The method is then extended to treat the case of two particularly simple models of {\it non universal} type, for which it is possible to draw analogous conclusions.
Beccaria Matteo
Renard Fernand M.
Spagnolo Sergio
Verzegnassi Claudio
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