Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-08-04
Phys.Rev.Lett. 95 (2005) 232001
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages (RevTeX), 4 figures; a few claryifying phrases and a reference added, typos corrected
Scientific paper
10.1103/PhysRevLett.95.232001
We perform a relativistic chiral effective-field theory calculation of the pion electroproduction off the nucleon ($e^- N \to e^- N \pi$) in the Delta(1232)-resonance region. After fixing the three low-energy constants, corresponding to the magnetic (M1), electric (E2), and Coulomb (C2) $\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 $Q^2$.
Pascalutsa Vladimir
Vanderhaeghen Marc
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