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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

Abbiendi, G; Ackerstaff, K; Alexander, G; Allison, J; Altekamp, N; Anderson, KJ; Anderson, S; ... Gingrich, DM; + view all (1999) Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 183 GeV at LEP. European Physical Journal C , 6 (1) pp. 1-18.

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Abstract

Cross-sections for hadronic, bb̄ and lepton pair final states in e + e - collisions at √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=130 and 136 GeV. The results are used to measure the energy dependence of the electromagnetic coupling constant α em , 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.

Type: Article
Title: Tests of the standard model and constraints on new physics from measurements of fermion-pair production at 183 GeV at LEP
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/33307
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