Invariant Amplitudes for Pion Electroproduction

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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.
18 pages, 8 figures

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High Energy Physics - Phenomenology, Nuclear Theory

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http://salesiana.dossiersoluciones.com/handle/123456789/191829

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0712.2327
 http://arxiv.org/abs/0712.2327
 Eur.Phys.J.A34:387-403,2007
 doi:10.1140/epja/i2007-10510-7

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arXiv