2000/03/01 by The OPAL collaboration, G. Abbiendi, K. Ackerstaff +98 · 1 citation
Physics and Astronomy · #Annihilation #Boson #Electron #Electron–positron annihilation #Hadron #High-Energy Particle Collisions Research #Lepton #Nuclear physics #Pair production #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Quantum Chromodynamics and Particle Interactions #Quark #Standard Model (mathematical formulation) #hep-ex
paper · pdf · doi:10.1016/s0370-2693(00)00197-0
published as Phys.Lett.B476:256-272,2000 · 20 pages, 4 figures, submitted to Phys. Lett. B
openalex publication_date 2000/03/01 · arxiv created 2000/03/13 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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% C.L. upper limit is 0.55 pb. Limits on anomalous ZZgamma and ZZZ couplings are derived.