2000/02/14 by L3 Collaboration, M. Acciarri, P. Achard +98
Physics and Astronomy · #Astrophysics #Cross section (physics) #Electron–positron annihilation #Gauge (firearms) #Gauge boson #Gauge theory #Hadron #High-Energy Particle Collisions Research #Lambda #Luminosity #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Standard Model (mathematical formulation) #hep-ex
paper · pdf · doi:10.1016/s0370-2693(00)00279-3
published as Phys.Lett.B478:39-49,2000
arxiv created 2000/02/14 · openalex publication_date 2000/04/01 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A first measurement of the cross section of the process e+e- -> Z gamma gamma is reported using a total integrated luminosity of 231 pb-1 collected with the L3 detector at centre-of-mass energies of 182.7 GeV and 188.7 GeV. By selecting hadronic events with two isolated photons the e+e- -> Z gamma gamma cross section is measured to be 0.49 +0.20 -0.17 +/- 0.04 pb at 182.7 GeV and 0.47 +/- 0.10 +/- 0.04 pb at 188.7 GeV. The measurements are consistent with Standard Model expectations. Limits on Quartic Gauge Boson Couplings a0/Lambda2 and ac/Lambda2 of -0.009 GeV-2 < a0/Lambda2 < 0.008 GeV-2 and -0.007 GeV-2 < ac/Lambda2 < 0.013 GeV-2 are derived at 95% confidence level.