Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 189 GeV at LEP

OPAL Collaboration (2000) Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 189 GeV at LEP. European Physical Journal C: Particles and Fields, 13 (4). pp. 553-572. ISSN 1434-6044

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Abstract

Cross-sections and angular distributions for hadronic and lepton pair final states in e+e− 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 αemαem , 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 μ+μ− and τ+τ− final states is also presented.

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:
?? PHYSICS AND ASTRONOMY (MISCELLANEOUS)ENGINEERING (MISCELLANEOUS) ??
ID Code:
82851
Deposited By:
Deposited On:
14 Nov 2016 12:48
Refereed?:
Yes
Published?:
Published
Last Modified:
20 Sep 2023 00:57