Determination of the e+e- -> gamma gamma (gamma) cross-section at LEP 2

Details Determination of the e+e- -> gamma gamma (gamma) cross-section at LEP 2 Determination of the e+e- -> gamma gamma (gamma) cross-section at LEP 2

2004-09-28

arxiv.org/abs/hep-ex/0409058v1

Eur.Phys.J.C37:405-419,2004

Physics

High Energy Physics

High Energy Physics - Experiment

24 pages, 5 figures, Accepted by Eur. Phys. J. C

Scientific paper

10.1140/epjc/s2004-01990-2

A test of the benchmark QED process e+e- -> gamma gamma (gamma) is reported, using the data collected with the DELPHI detector at LEP 2. The data analysed were recorded at centre-of-mass energies ranging from 161 GeV to 208 GeV and correspond to a total integrated luminosity of 656.4 pb^{-1}. The Born cross-section for the process e+e- -> gamma gamma (gamma) was determined, confirming the validity of QED at the highest energies ever attained in electron-positron collisions. Lower limits on the parameters of a number of possible deviations from QED, predicted within theoretical frameworks expressing physics beyond the Standard Model, were derived.

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