Large logarithms in the beam normal spin asymmetry of elastic electron-proton scattering

Journal Article · Fri Oct 01 00:00:00 EDT 2004 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.70.073002· OSTI ID:20705309

Afanasev, Andrei V ^[1]; Merenkov, N P ^[2]

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1. Jefferson Lab, Newport News, Virginia 23606 (United States)
2. NSC 'Kharkov Institute of Physics and Technology', Kharkov 61108 (Ukraine)

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 quasireal 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 ppm. 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.

• OSTI ID: 20705309
• Journal Information: Physical Review. D, Particles Fields, Vol. 70, Issue 7; Other Information: DOI: 10.1103/PhysRevD.70.073002; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ASYMMETRY
ELASTIC SCATTERING
ELECTRON BEAMS
ELECTRON-PROTON INTERACTIONS
ELECTRONS
EXCITATION
INTERMEDIATE STATE
MOMENTUM TRANSFER
P INVARIANCE
PARITY
PERIPHERAL MODELS
PHOTONS
PHOTOPRODUCTION
PROTONS
SPIN