Abstract
We calculate the form factors of the electromagnetic nucleon-to--resonance transition to third chiral order in manifestly Lorentz-invariant chiral effective field theory. For the purpose of generating a systematic power counting, the complex-mass scheme is applied in combination with the small-scale expansion. We fit the results to available empirical data. To improve our results, we include a contribution of the meson at tree level in a semiphenomenological approach.
4 More- Received 29 December 2017
DOI:https://doi.org/10.1103/PhysRevC.97.035205
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