Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-11-24
Phys.Rev.Lett.100:131602,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 5 figures; v.2 with revised text version for PRL, results completely unchanged
Scientific paper
10.1103/PhysRevLett.100.131602
Using dispersion relations, we derive the complete virtual QED contributions to Bhabha scattering due to vacuum polarization effects in photon propagation. We apply our result to hadronic corrections and to heavy lepton and top quark loop insertions. We give the first complete estimate of their net numerical effects for both small and large angle scattering at typical beam energies of meson factories, LEP, and the ILC. The effects turn out to be smaller, in most cases, than those corresponding to electron loop insertions, but stay, with amounts of typically one per mille, of relevance for precision experiments. Hadronic corrections themselves are typically about 2-3 times larger than those of intermediate muon pairs (the largest heavy leptonic terms).
Actis Stefano
Czakon Michal
Gluza Janusz
Riemann Tord
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