Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1998-08-17
Phys.Lett.B438:379-390,1998
Physics
High Energy Physics
High Energy Physics - Experiment
19 pages, LaTeX, 6 eps figures (and colour figs) included, submitted to Physics Letters
Scientific paper
10.1016/S0370-2693(98)01096-X
The process e+e- to gamma gamma (gamma) is studied using data recorded with the OPAL detector at LEP. The data sample corresponds to a total integrated luminosity of 56.2 pb-1 taken at a centre-of-mass energy of 183 GeV. The measured cross-section agrees well with the expectation from QED. A fit to the angular distribution is used to obtain improved limits at 95% CL on the QED cut-off parameters: Lambda+ > 233 GeV and Lambda- > 265 GeV as well as a mass limit for an excited electron, M(e*) > 227 GeV assuming equal e*egamma and eegamma couplings. No evidence for resonance production is found in the invariant mass spectrum of photon pairs. Limits are obtained for the cross-section times branching ratio for a resonance decaying into two photons.
et al Ackerstaff K.
The OPAL Collaboration
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