Double logarithmical corrections to beam asymmetry in polarized electron-proton scattering

Details Double logarithmical corrections to beam asymmetry in polarized electron-proton scattering Double logarithmical corrections to beam asymmetry in polarized electron-proton scattering

2007-06-17

arxiv.org/abs/0706.2474v2

Phys.Lett.B655:196-199,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 8 figures

Scientific paper

10.1016/j.physletb.2007.08.068

The up-down asymmetry in transversally polarized electron proton scattering is induced by the interference between one and two photon exchange amplitudes. Inelastic intermediate hadronic states (different from one-proton state) of the two photon exchange amplitude give rise to contributions containing the square of "large logarithm" (logarithm of the ratio of the transferred momentum to the electron mass). We investigate the presence of such contributions in higher orders of perturbation theory. The relation with the case of zero transfer momentum is explicitly given. The mechanism of cancellation of infrared singularities is discussed.

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