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Production of events with hadronic and leptonic final states has beenmeasured in e^+e^- collisions at centre-of-mass energies of 130-172 GeV, usingthe OPAL detector at LEP. Cross-sections and leptonic forward-backwardasymmetries are presented, both including and excluding the dominant productionof radiative Z \gamma events, and compared to Standard Model expectations. Theratio R_b of the cross-section for bb(bar) production to the hadroniccross-section has been measured. In a model-independent fit to the Z lineshape,the data have been used to obtain an improved precision on the measurement of\gamma-Z interference. The energy dependence of \alpha_em has beeninvestigated. The measurements have also been used to obtain limits onextensions of the Standard Model described by effective four-fermion contactinteractions, to search for t-channel contributions from new massive particlesand to place limits on chargino pair production with subsequent decay of thechargino into a light gluino and a quark pair.

Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 130–172 GeV at LEP