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Determination of the e+ e- ! Gamma (gamma) cross-section at LEP 2.

Research output: Contribution to journalJournal article

<mark>Journal publication date</mark>11/2004
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number4
Number of pages15
Pages (from-to)405-419
<mark>Original language</mark>English


A test of the benchmark QED process 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 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.