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

Kartvelishvili, Vakhtang (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: Particles and Fields, 6 (1). pp. 1-18. ISSN 1434-6044

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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.

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:
ID Code:
82582
Deposited By:
Deposited On:
02 Nov 2016 14:44
Refereed?:
Yes
Published?:
Published
Last Modified:
11 Mar 2020 05:40