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Aspects of nucleon Compton scattering

Authors:	V Bernard N Kaiser Ulf -G Meißner A Schmidt

Institution:	1. Centre de Recherches Nucléaires et Université Louis Pasteur de Strasbourg, Physique Théorique, BP 20Cr, F-67037, Strasbourg Cedex 2, France 2. Physik Department T30, Technische Universit?t München, James Franck Strasse, D-85747, Garching, Germany

Abstract:	We consider the spin-averaged nucleon forward Compton scattering amplitude in heavy baryon chiral perturbation theory including all terms to order $\mathcal{O}(q^4 )$ . The chiral prediction for the spin-averaged forward Compton scattering amplitude is in good agreement with the data for photon energies110 MeV. We also evaluate the nucleon electric and magnetic Compton polarizabilities to this order and discuss the uncertainties of the various counter terms entering the chiral expansion of these quantities.

Keywords:	PACS" target="_blank">PACS 12 38 Lg 13 60 Fz 14 20 Dh
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