Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1999-08-03
Eur.Phys.J.C13:553-572,2000
Physics
High Energy Physics
High Energy Physics - Experiment
42 pages, LaTeX, including 14 eps figs, submitted to European Physical Journal C
Scientific paper
10.1007/s100520050718
Cross-sections and angular distributions for hadronic and lepton pair final states in e+e- collisions at a centre-of-mass energy near 189 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The results are used to measure the energy dependence of the electromagnetic coupling constant alpha_em, and to place limits on new physics as described by four-fermion contact interactions or by the exchange of a new heavy particle such as a sneutrino in supersymmetric theories with R-parity violation. A search for the indirect effects of the gravitational interaction in extra dimensions on the mu+mu- and tau+tau- final states is also presented.
Abbiendi Giovanni
The OPAL Collaboration
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