Running of the QED coupling in small-angle Bhabha scattering at LEP
G. Abbiendi
Abstract
Using the OPAL detector at LEP, the running of the effective QED coupling alpha(t) is measured for space-like momentum transfer, 2 ≤ -t ≤ 6 GeV2, from the angular distribution of small-angle Bhabha scattering. This is currently the most significant direct observation of the running of the QED coupling in a single experiment and the first clear evidence of the hadronic contribution to the running in the space-like region. Our result is in good agreement with standard evaluations of alpha(t), based on data in the time-like region.
Create a lesson
Related papers
Operational Challenges in Efficient and Sustainable Operation of the Event Processing Nodes GPU Farm at the ALICE Experiment
Federico Ronchetti, Giada Erba
Measurements of isolated photon pair production in association with jets in pp collisions at s = 8 TeV with the ATLAS detector
ATLAS Collaboration
Projected sensitivity of the detector to photophobic and fermion-coupled axion-like particles
Riley Aumonier, Oleg Brandt, Theo Reymermier et al.
Search for heavy neutral leptons in top quark decays with same-sign, same-flavor dilepton final states in proton-proton collisions at s = 13 TeV
CMS Collaboration
A New Precise Measurement of the e+e-π+π-(γ) Cross Section with the Initial-State Radiation Method at BaBar
BaBar Collaboration
A New Precise Measurement of the e+e-π+π-(γ) Cross Section with the Initial-State Radiation Method at BaBar
BaBar Collaboration