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Tests of the Standard Model and constraints on new physics from measurements of fermion-pair production at 183 GeV at LEP

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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  • OPAL Collaboration
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<mark>Journal publication date</mark>01/1999
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number1
Volume6
Number of pages18
Pages (from-to)1-18
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Cross-sections for hadronic, bb¯bb¯ and lepton pair final states in e+e−e+e− collisions at s√s =183 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. Forward-backward asymmetries for the leptonic final states have also been measured. Cross-sections and asymmetries are also presented for data recorded in 1997 at s√s =130 and 136 GeV. 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 leptoquark, or of a squark or sneutrino in supersymmetric theories with R-parity violation.