Two photon effects in electron scattering

  • P.A.M. Guichon
Conference paper


The apparent discrepancy between the Rosenbluth and the polarization transfer method for the ratio of the electric to magnetic proton form factors can be explained by a two-photon exchange correction which does not destroy the linearity of the Rosenbluth plot. Though intrinsically small, of the order of a few percent of the cross section, this correction is kinematically enhanced in the Rosenbluth method while it is small for the polarization transfer method, at least in the range of Q 2 where it has been used until now.


Form Factor Born Approximation Polarization Method Electromagnetic Form Factor Photon Effect 
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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • P.A.M. Guichon
    • 1
  1. 1.SPhN/DAPNIA, CEA SaclayGif sur YvetteFrance

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