Beam normal spin asymmetry in elastic lepton-nucleon scattering

Details Beam normal spin asymmetry in elastic lepton-nucleon scattering Beam normal spin asymmetry in elastic lepton-nucleon scattering

2004-04-23

arxiv.org/abs/hep-ph/0404206v1

Nucl.Phys. A741 (2004) 234-248

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 5 figures

Scientific paper

10.1016/j.nuclphysa.2004.06.008

We discuss the two-photon exchange contribution to observables which involve lepton helicity flip in elastic lepton-nucleon scattering. This contribution is accessed through the spin asymmetry for a lepton beam polarized normal to the scattering plane. We estimate this beam normal spin asymmetry at large momentum transfer using a parton model and we express the corresponding amplitude in terms of generalized parton distributions.

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