Two-Photon Exchange in Elastic Electron-Proton Scattering: A QCD Factorization Approach

Journal Article · Fri Aug 28 00:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.103.092004· OSTI ID:21364645

Kivel, Nikolai ^[1]; Vanderhaeghen, Marc ^[2]

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1. Institute fuer Theoretische Physik II, Ruhr-Universitaet Bochum, D-44780 Bochum (Germany)
2. Institut fuer Kernphysik, Johannes Gutenberg-Universitaet, D-55099 Mainz (Germany)

We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer Q{sup 2}. It is shown that the leading two-photon exchange amplitude behaves as 1/Q{sup 4}, and can be expressed in a model independent way in terms of the leading twist nucleon distribution amplitudes. Using several models for the nucleon distribution amplitudes, we provide estimates for existing data and for ongoing experiments.

• OSTI ID: 21364645
• Journal Information: Physical Review Letters, Vol. 103, Issue 9; Other Information: DOI: 10.1103/PhysRevLett.103.092004; (c) 2009 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRON-PROTON INTERACTIONS
FACTORIZATION
MOMENTUM TRANSFER
NUCLEONS
PHOTONS
QUANTUM CHROMODYNAMICS
BARYONS
BOSONS
ELECTRON-NUCLEON INTERACTIONS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRONS
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MASSLESS PARTICLES
PARTICLE INTERACTIONS
QUANTUM FIELD THEORY