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Article
Report number hep-ex/0003016 ; CERN-EP-2000-017 ; CERN-EP-2000-017
Title Z boson pair production in e+e collisions at s = 183 and 189 GeV
Author(s) OPAL Collaboration  Prikaži svih 313 autora
Affiliation (CERN)
Publication 2000
Imprint 13 Mar 2000
Number of pages 21
Note 20 pages, 4 figures, submitted to Phys. Lett. B Report-no: CERN-EP-2000-017
In: Phys. Lett. B 476 (2000) 256-72
DOI 10.1016/S0370-2693(00)00197-0
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; OPAL
Abstract A study of Z boson pair production in e+e- annihilation at center-of-mass energies near 183 GeV and 189 GeV is reported. Final states containing only leptons, (l+l-l+l- and l+l-nu nubar), quark and lepton pairs, (q qbar l+l-, q qbar nu nubar) and the all-hadronic final state (q qbar q qbar) are considered. In all states with at least one Z boson decaying hadronically, q qbar and b bbar final states are considered separately using lifetime and event-shape tags, thereby improving the cross-section measurement. At sqrt(s) = 189 GeV the Z-pair cross section was measured to be 0.80 (+0.14-0.13, stat.) (+0.06-0.05, syst.) pb, consistent with the Standard Model prediction. At sqrt(s) = 183 GeV the 95.L. upper limit is 0.55 pb. Limits on anomalous ZZgamma and ZZZ couplings are derived.
Copyright/License Preprint: (License: CC-BY-4.0)
Copyright @ unknown. Published by Elsevier B.V.

Corresponding record in: Inspire
Email contact: dave.miller@cern.ch


 Zapis kreiran 2000-03-14, zadnja izmjena 2021-10-29


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0003016 - Download fulltextPDF
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