Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP - INSPIRE

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Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP

L3

Collaboration

May, 2005

18 pages

Published in:

Phys.Lett.B 623 (2005) 26-36

e-Print:

hep-ex/0507078 [hep-ex]

DOI:

10.1016/j.physletb.2005.07.052

Report number:

CERN-PH-EP-2005-021

Experiments:

CERN-LEP-L3

View in:

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Abstract: (Elsevier)

The evolution of the electromagnetic coupling, α , in the momentum-transfer range 1800 GeV2<−Q2<21600 GeV2 is studied with about 40 000 Bhabha-scattering events collected with the L3 detector at LEP at centre-of-mass energies s=189–209 GeV . The running of α is parametrised as: α(Q2)=α01−CΔα(Q2), where α0≡α(Q2=0) is the fine-structure constant and C=1 corresponds to the evolution expected in QED. A fit to the differential cross section of the e+e−→e+e− process for scattering angles in the range |cosθ|<0.9 excludes the hypothesis of a constant value of α , C=0 , and validates the QED prediction with the result: C=1.05±0.07±0.14, where the first uncertainty is statistical and the second systematic.

electron positron: colliding beams
electron positron: elastic scattering
coupling constant: electromagnetic interaction
momentum transfer dependence
L3
experimental results
CERN LEP Stor
189-209 GeV-cms

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