Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1998-08-21
Eur.Phys.J.C6:1-18,1999
Physics
High Energy Physics
High Energy Physics - Experiment
35 pages, LaTeX, 12 ps figures (and 9 colour figs) included, submitted to European Physical Journal C
Scientific paper
10.1007/s100529801027
Cross-sections for hadronic, b-bbar and lepton pair final states in e+e- collisions at sqrt(s) = 183 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. Forward-backward asymmetries for the leptonic final states have also been measured. Cross-sections and asymmetries are also presented for data recorded in 1997 at sqrt(s) = 130 and 136 GeV. 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 leptoquark, or of a squark or sneutrino in supersymmetric theories with R-parity violation.
et al Abbiendi G.
The OPAL Collaboration
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