### Chiral effective-field theory with a resonance and heavy fieldsChiral effective-field theory with a resonance and heavy fields

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 Author Pascalutsa, Vladimir Source arXiv.org Content type Text File Format PDF Date of Submission 2009-10-20 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics Subject Keyword Nuclear Theory ♦ High Energy Physics - Phenomenology ♦ physics:hep-ph ♦ physics:nucl-th Abstract Several conceptual points concerning the inclusion of the $\Delta$(1232) resonance in the framework of chiral effective-field theory are discussed, with an emphasis on the problem of power counting in the baryon sector in general. I also formulate a new dispersion relation in the pion-mass squared (or, the quark mass) and make a link between the power counting and the analytic properties of chiral expansion. A controversy regarding the determination of the proton's magnetic polarizability from Compton-scattering data is stressed here as well. Description Reference: PoS CD09:095,2009 Educational Use Research Learning Resource Type Article Page Count 10