Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-05-24
Eur.Phys.J.C45:1-21,2006
Physics
High Energy Physics
High Energy Physics - Experiment
43 pages, 12 figures, Submitted to Euro. Phys. J. C
Scientific paper
10.1140/epjc/s2005-02389-3
Using the OPAL detector at LEP, the running of the effective QED coupling alpha(t) is measured for space-like momentum transfer from the angular distribution of small-angle Bhabha scattering. In an almost ideal QED framework, with very favourable experimental conditions, we obtain: Delta alpha(-6.07GeV^2) - Delta alpha(-1.81GeV^2) = (440 pm 58 pm 43 pm 30) X 10^-5, where the first error is statistical, the second is the experimental systematic and the third is the theoretical uncertainty. This agrees with current evaluations of alpha(t).The null hypothesis that alpha remains constant within the above interval of -t is excluded with a significance above 5sigma. Similarly, our results are inconsistent at the level of 3sigma with the hypothesis that only leptonic loops contribute to the running. This is currently the most significant direct measurment where the running alpha(t) is probed differentially within the measured t range.
Abbiendi Giovanni
The OPAL Collaboration
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