Study of Multiphoton Final States and Tests of QED in e+e- collisions at (s) up to 209 GeV
Abstract
The process e+ e- -> n gamma with n>=2 is studied at centre-of-mass energies ranging from (s)=192 to 208 GeV. The data sample corresponds to a total integrated luminosity of 427 1/pb. The total and differential cross sections are found to be in agreement with the QED expectations. Using all the data collected with the L3 detector above the Z pole, limits on deviations from QED, excited electrons, contact interactions, extra space dimensions and excited spin-3/2 leptons are set.
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