Invariant Amplitudes for Pion Electroproduction

Details Invariant Amplitudes for Pion Electroproduction Invariant Amplitudes for Pion Electroproduction

2007-12-14

arxiv.org/abs/0712.2327v1

Eur.Phys.J.A34:387-403,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 8 figures

Scientific paper

10.1140/epja/i2007-10510-7

The invariant amplitudes for pion electroproduction on the nucleon are evaluated by dispersion relations at constant t with MAID as input for the imaginary parts of these amplitudes. In the threshold region these amplitudes are confronted with the predictions of several low-energy theorems derived in the soft-pion limit. In general agreement with Chiral Perturbation Theory, the dispersive approach yields large corrections to these theorems because of the finite pion mass.

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