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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 543885.0, MPI für Physik / MPI für Physik
Measurement of the running of the QED coupling in small-angle Bhabha scattering at LEP
Authors:The OPAL Collaboration; Abbiendi, G.
Date of Publication (YYYY-MM-DD):2006
Title of Journal:European Physical Journal C
Journal Abbrev.:Eur.Phys.J.C
Issue / Number:45
Start Page:1
End Page:21
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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.
Classification / Thesaurus:OPAL
Comment of the Author/Creator:43 pages, 12 figures, Submitted to Euro. Phys. J. C
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2005-185
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/hep-ex/0505072
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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