Electromagnetic Nucleon-to-Delta Transition in Chiral Effective-Field Theory
Journal Article
·
OSTI ID:842281
We perform a relativistic chiral effective-field theory calculation of the pion electroproduction off the nucleon (e{sup -} N {yields} e{sup -} N {pi}) in the {Delta}(1232)-resonance region. After fixing the three low-energy constants, corresponding to the magnetic (M1), electric (E2), and Coulomb (C2) {gamma} N {Delta} couplings, our calculation provides a prediction for the momentum-transfer and pion-mass dependence of the {gamma} N {Delta} form factors. The prediction for the pion-mass dependence resolves the discrepancy between the recent lattice QCD results and the experimental value for the ''C2/M1 ratio'' at low Q{sup 2}.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 842281
- Report Number(s):
- JLAB-THY-05-394; DOE/ER/40150-3539; TRN: US0503265
- Country of Publication:
- United States
- Language:
- English
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