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Updated: Jul 30, 2026

Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
Electromagnetic nucleon-to-delta transition in chiral effective-field theory
Vladimir Pascalutsa1, Marc Vanderhaeghen
1Physics Department, The College of William & Mary, Williamsburg, Virginia 23187, USA. vlad@jlab.org
Abstract:
We perform a relativistic chiral effective-field theory calculation of pion electroproduction off the nucleon (e- N --> e- 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) gammaNdelta couplings, our calculation provides a prediction for the momentum transfer and pion-mass dependence of the gammaNdelta 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.
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