Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1997-08-17
Eur.Phys.J.C2:441-472,1998
Physics
High Energy Physics
High Energy Physics - Experiment
68 pages, LaTeX, uses a4p.sty and pennames.sty, 23 eps figures included, submitted to Zeit. Phys. C
Scientific paper
10.1007/s100520050152
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 Z \gamma events, and compared to Standard Model expectations. The ratio R_b of the cross-section for bb(bar) production to the hadronic cross-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 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 chargino pair production with subsequent decay of the chargino into a light gluino and a quark pair.
et al Ackerstaff K.
The OPAL Collaboration
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