{delta} Resonance Contribution to Two-Photon Exchange in Electron-Proton Scattering

Journal Article · Fri Oct 21 00:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.172503· OSTI ID:20699468

Kondratyuk, S; Blunden, P G; Melnitchouk, W; Tjon, J A ^[1]

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1. Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 (Canada)

We calculate the effects on the elastic electron-proton scattering cross section of the two-photon exchange contribution with an intermediate {delta} resonance. The {delta} two-photon exchange contribution is found to be smaller in magnitude than the previously evaluated nucleon contribution, with an opposite sign at backward scattering angles. The sum of the nucleon and {delta} two-photon exchange corrections has an angular dependence compatible with both the polarization-transfer and the Rosenbluth methods of measuring the nucleon electromagnetic form factors.

• OSTI ID: 20699468
• Journal Information: Physical Review Letters, Vol. 95, Issue 17; Other Information: DOI: 10.1103/PhysRevLett.95.172503; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CORRECTIONS
CROSS SECTIONS
DELTA BARYONS
ELECTROMAGNETIC FORM FACTORS
ELECTRON-PROTON INTERACTIONS
NUCLEONS
PERIPHERAL MODELS
PHOTONS
POLARIZATION
RESONANCE
SCATTERING