Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2008-03-17
Phys.Rev.C78:025209,2008
Physics
High Energy Physics
High Energy Physics - Experiment
22 pages, 16 figures. Accepted for publication in Phys. Rev. C Minor changes in figures and text based upon referee commentary
Scientific paper
10.1103/PhysRevC.78.025209
The determination of non-spherical angular momentum amplitudes in nucleons at long ranges (low Q^{2}), was accomplished through the $p(\vec{e},e'p)\pi^0$ reaction in the Delta region at $Q^2=0.060$, 0.127, and 0.200 (GeV/c)^2 at the Mainz Microtron (MAMI) with an accuracy of 3%. The results for the dominant transition magnetic dipole amplitude and the quadrupole to dipole ratios have been obtained with an estimated model uncertainty which is approximately the same as the experimental uncertainty. Lattice and effective field theory predictions agree with our data within the relatively large estimated theoretical uncertainties. Phenomenological models are in good agreement with experiment when the resonant amplitudes are adjusted to the data. To check reaction model calculations additional data were taken for center of mass energies below resonance and for the $\sigma_{TL'}$ structure function. These results confirm the dominance, and general Q^2 variation, of the pionic contribution at large distances.
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