Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 130-172 GeV at LEP
The OPAL Collaboration, K.Ackerstaff8 et al.
8 CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland
Received: 30 July 1997 / Published online: 10 March 1998
Production of events with hadronic and leptonic final states has been measured in e+e- collisions at centre-of-mass energies of 130-172 GeV, using the OPAL detector at LEP. Cross-sections and leptonic forward-backward asymmetries are presented, both including and excluding the dominant production of radiative events, and compared to Standard Model expectations. The ratio of the cross-section for production to the hadronic cross-section has been measured. In a model-independent fit to the lineshape, the data have been used to obtain an improved precision on the measurement of - interference. The energy dependence of has been investigated. The measurements have also been used to obtain limits on extensions of the Standard Model described by effective four-fermion contact interactions, to search for t-channel contributions from new massive particles and to place limits on gaugino pair production with subsequent decay of the gaugino into a light gluino and a quark pair.