{Delta} resonance contribution to two-photon exchange in electron-proton scattering

Journal Article · Wed Jun 01 00:00:00 EDT 2005

OSTI ID:840753

Kondratyuk, S; Blunden, P G; Melnitchouk, W; Tjon, J A

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 the angular dependence compatible with both the polarization transfer and the Rosenbluth methods of measuring the nucleon electromagnetic form factors.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE; USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 840753
• Report Number(s): JLAB-THY-05-324; DOE/ER/40150-3451; nucl-th/0506026; TRN: US0502147
• Resource Relation: Other Information: No journal information given for this preprint; PBD: 1 Jun 2005
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
ELECTROMAGNETIC FORM FACTORS
NUCLEONS
POLARIZATION
RESONANCE
SCATTERING