{gamma}*N{delta} form factors from a relativistic dynamical model of pion electroproduction
- Institute of Nuclear and Particle Physics (INPP), Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701 (United States)
- Department of Physics, The College of William and Mary, Williamsburg, Virginia 23188 (United States)
- Theory Group, Jefferson Laboratory, 12000 Jefferson Avenue, Newport News, Virginia 23606 (United States)
We obtain the electromagnetic form factors of the {gamma}N{delta} transition by analyzing recent pion-electroproduction data using a fully relativistic dynamical model. Special care is taken to satisfy Ward-Takahashi identities for the Born term in the presence of form factors, thereby allowing the use of realistic electromagnetic form factors of the nucleon and pion. We parametrize the Q{sup 2} dependence of the bare {gamma}N{delta} form factors by a three-parameter form which is consistent with the asymptotic behavior inferred from QCD. The parameters of the bare {gamma}N{delta} form factors are the only free parameters of the model and are fitted to the differential cross-section and multipole-analysis data up to Q{sup 2}=4(GeV/c){sup 2} in the {delta}(1232)-resonance region. This analysis emphasizes the significance of the pion-cloud effects in the extraction of the resonance parameters.
- OSTI ID:
- 20695497
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 70, Issue 3; Other Information: DOI: 10.1103/PhysRevC.70.032201; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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