Multiphoton production in e+ e- collisions at S**(1/2) = 183-GeV

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.

Note:

19 pages, LaTeX, 6 eps figures (and colour figs) included, submitted to Physics Letters Report-no: CERN-EP/98-092

electron positron: colliding beams
electron positron: annihilation
photon: multiple production
mass spectrum: two-photon
final state: (3photon)
resonance: search for
resonance: radiative decay
photon: angular distribution
quantum electrodynamics: Lambda parameter
e*

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