Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-07-15
Phys.Lett. B599 (2004) 48
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, 5 figures, Corrected an algebraic error in Eq.(17), other formulas and plots changed accordingly
Scientific paper
10.1016/j.physletb.2004.08.023
The parity-conserving single-spin beam asymmetry of elastic electron-proton scattering is induced by an absorptive part of the two-photon exchange amplitude. We demonstrate that this asymmetry has logarithmic and double-logarithmic enhancement due to contributions of hard collinear quasi-real photons. An optical theorem is used to evaluate the asymmetry in terms of the total photoproduction cross section on the proton, predicting its magnitude at a few parts per million for high electon beam energies and small scattering angles. At fixed 4-momentum transfers, the asymmetry is rising logarithmically with increasing electron beam energy, following the high-energy diffractive behavior of total photoproduction cross section on the proton.
Afanasev Andrei
Merenkov N. P.
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