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Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 189-209 GeV at LEP

  • The OPAL Collaboration
experimental physics

Abstract.

Cross-sections and angular distributions for hadronic and lepton-pair final states in e + e- collisions at centre-of-mass energies between 189 GeV and 209 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The measurements are used to determine the electromagnetic coupling constant \(\alpha_{\mathrm{em}}\) at LEP 2 energies. In addition, the results are used together with OPAL measurements at 91-183 GeV within the S-matrix formalism to determine the \(\gamma\)-Z interference term and to make an almost model-independent measurement of the Z mass. Limits on extensions to the Standard Model described by effective four-fermion contact interactions or the addition of a heavy Z’ boson are also presented.

Keywords

Angular Distribution Opal Detector Contact Interaction Interference Term Electromagnetic Coupling 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin/Heidelberg 2004

Authors and Affiliations

  • The OPAL Collaboration

There are no affiliations available

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