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

Kartvelishvili, Vakhtang (1998) Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 130–172 GeV at LEP. European Physical Journal C: Particles and Fields, 2 (3). pp. 441-472. ISSN 1434-6044

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Abstract

Production of events with hadronic and leptonic final states has been measured in e+e−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 γγ events, and compared to Standard Model expectations. The ratio RbRb of the cross-section for bb¯bb¯ 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 γγ -Z interference. The energy dependence of αemαem 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 tt -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.

Item Type: Journal Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2200/2201
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 82536
Deposited By: ep_importer_pure
Deposited On: 01 Nov 2016 12:16
Refereed?: Yes
Published?: Published
Last Modified: 11 Feb 2020 09:06
URI: https://eprints.lancs.ac.uk/id/eprint/82536

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