Compilation and analysis of charge asymmetry measurements from electron and positron scattering on nucleon and nuclei

Details Compilation and analysis of charge asymmetry measurements from electron and positron scattering on nucleon and nuclei Compilation and analysis of charge asymmetry measurements from electron and positron scattering on nucleon and nuclei

2009-09-25

arxiv.org/abs/0909.4736v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 7 figures 2 tables

Scientific paper

World data of elastic and inelastic scattering of electrons and positrons on nucleon and nuclei are compiled and discussed. The evidence of an experimental charge asymmetry different from zero, being a pure quantum effect, would be a signature of contributions beyond the Born approximation. After reviewing the published results, we compare the elastic data to a calculation which includes the box diagram due to two-photon exchange. We show that all the data on the cross section ratio are compatible with the assumption that the hard two-photon contribution is negligible.

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