2003/09/17 by The OPAL Collaboration, The OPAL collaboration, G. Abbiendi · 4 citations
Physics and Astronomy · #Boson #Coupling (piping) #Coupling constant #Detector #Electron–positron annihilation #Fermion #Formalism (music) #Hadron #High-Energy Particle Collisions Research #Lepton #Nuclear physics #Pair production #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Standard Model (mathematical formulation) #hep-ex
paper · pdf · doi:10.1140/epjc/s2004-01595-9
published as Eur.Phys.J.C33:173-212,2004 · 79 pages, 22 figures, Submitted to Eur. Phys. J. C
arxiv created 2003/09/17 · openalex publication_date 2004/03/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Cross-section and angular distributions for hadronic and lepton-pair final states in e+e- collisions at centre-of-mass energies between 189 GeV and 209 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The measurements are used to determine the electromagnetic coupling constant alphaem at LEP2 energies. In addition, the results are used together with OPAL measurements at 91-183 GeV within the S-matrix formalism to determine the gamma-Z interference term and to make an almost model-independent measurement of the Z mass. Limits on extensions to the Standard Model described by effective four-fermion contact interactions or the addition of a heavy Z boson are also presented.