Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 189 GeV at LEP |
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Authors: | G Abbiendi |
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Institution: | (1) Dipartimento di Fisica dell' Università di Bologna and INFN, I-40126 Bologna, Italy , IT |
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Abstract: | Cross-sections and angular distributions for hadronic and lepton pair final states in 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 , 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 and final states is also presented.
Received: 9 July 1999 / Published online: 17 February 2000 |
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