Electromagnetic Nucleon-to-Delta Transition in Chiral Effective-Field Theory
Journal Article
·
· Physical Review Letters
- Physics Department, College of William and Mary, Williamsburg, Virginia 23187 (United States)
We perform a relativistic chiral effective-field theory calculation of 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}.
- OSTI ID:
- 20699642
- Journal Information:
- Physical Review Letters, Vol. 95, Issue 23; Other Information: DOI: 10.1103/PhysRevLett.95.232001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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