Tests of the standard model and constraints on new physics from measurements of fermion pair production at 183-GeV at LEP

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.

electron positron: colliding beams
electron positron: annihilation
quark: pair production
lepton: pair production
angular distribution: asymmetry
channel cross section
cross section: hadronic
coupling constant: electromagnetic interaction
energy dependence
new interaction: four-fermion interaction

References(60)

Figures(0)

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