Actions for Large Logarithms in the Beam Normal Spin Asymmetry of Elastic Electron--Proton Scattering [electronic resource].

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Large Logarithms in the Beam Normal Spin Asymmetry of Elastic Electron--Proton Scattering [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 2004.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
260.9 Kilobytes pages : digital, PDF file
Additional Creators
Thomas Jefferson National Accelerator Facility (U.S.), United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
We study a parity-conserving single-spin beam asymmetry of elastic electron-proton scattering induced by an absorptive part of the two-photon exchange amplitude. It is demonstrated that excitation of inelastic hadronic intermediate states by the consecutive exchange of two photons leads to logarithmic and double-logarithmic enhancement due to contributions of hard collinear quasi-real photons. The asymmetry at small electron scattering angles is expressed in terms of the total photoproduction cross section on the proton, and is predicted to reach the magnitude of 20-30 parts per million. At these conditions and 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.
Report Numbers
E 1.99:jlab-phy-04-238
E 1.99: doe/er/40150-2788
doe/er/40150-2788
jlab-phy-04-238
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Note
Published through SciTech Connect.
06/01/2004.
"jlab-phy-04-238"
" doe/er/40150-2788"
FT
Andrei Afanasev; Mykola Merenkov.
Funding Information
AC05-84ER40150
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