Electromagnetic Nucleon-to-Delta Transition in Chiral Effective-Field Theory [electronic resource].

Published: Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 2005.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description: 158.1 Kilobytes : digital, PDF file
Additional Creators: Thomas Jefferson National Accelerator Facility (U.S.), United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary

We perform a relativistic chiral effective-field theory calculation of the pion electroproduction off the nucleon (e⁻ N → e⁻ N π) in the Δ(1232)-resonance region. After fixing the three low-energy constants, corresponding to the magnetic (M1), electric (E2), and Coulomb (C2) γ N Δ couplings, our calculation provides a prediction for the momentum-transfer and pion-mass dependence of the γ N Δ 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 Q².

Report Numbers

E 1.99:jlab-thy-05-394
E 1.99: doe/er/40150-3539
doe/er/40150-3539
jlab-thy-05-394

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Published through SciTech Connect.
08/01/2005.
"jlab-thy-05-394"
" doe/er/40150-3539"
FT
Marc Vanderhaeghen; Vladimir Pascalutsa.

Funding Information

AC05-84ER40150

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