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Physics of Atomic Nuclei / Yadernaya Fizika 76 (2013) 937-946
Compilation and analysis of charge asymmetry measurements from electron and positron scattering on nucleon and nuclei
E. Tomasi-Gustafsson1, 2, M. Osipenko, E. A. Kuraev, Yu. Bystritsky

World data on the lepton-charge asymmetry in the elastic and inelastic lepton scattering off the proton and nuclei are compiled and discussed. After reviewing the published results, we compare the elastic data to a model calculation of the two-photon exchange mechanism. We show that the existing data do not provide any evidence for the two-photon contribution. At significance level 0.05 the data allow to exclude the two-photon exchange as an explanation for the difference between Rosenbluth and polarization measurements of proton electromagnetic form factors.
1:  IPNO - Institut de Physique Nucléaire d'Orsay
2:  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
Physics/High Energy Physics - Phenomenology
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