Accessing the Longitudinally Polarized Photon Content of the Proton

Details Accessing the Longitudinally Polarized Photon Content of the Proton Accessing the Longitudinally Polarized Photon Content of the Proton

2004-05-10

arxiv.org/abs/hep-ph/0405079v2

Phys.Rev.D70:034029,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version to appear in PRD

Scientific paper

10.1103/PhysRevD.70.034029

We investigate the QED Compton process (QEDCS) in longitudinally polarized lepton-proton scattering both in the elastic and inelastic channels and show that the cross section can be expressed in terms of the polarized equivalent photon distribution of the proton. We provide the necessary kinematical constraints to extract the polarized photon content of the proton using this process at HERMES, COMPASS and eRHIC. We also discuss the suppression of the major background process coming from virtual Compton scattering. We point out that such an experiment can give valuable information on $g_1(x_B, Q^2)$ in the small $x_B$, broad $Q^2$ region at the future polarized collider eRHIC and especially in the lower $Q^2$, medium $x_B$ region in fixed target experiments.

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