pith. sign in

arxiv: hep-ph/0412294 · v1 · submitted 2004-12-20 · ✦ hep-ph

Pion Photoproduction Amplitude Relations in the 1/N_c Expansion

classification ✦ hep-ph
keywords relationsexpansionamplitudesdirectlyphotoproductionpionagreementamplitude
0
0 comments X
read the original abstract

We derive expressions for pion photoproduction amplitudes in the 1/N_c expansion of QCD, and obtain linear relations directly from this expansion that relate electromagnetic multipole amplitudes at all energies. The leading-order relations in 1/N_c compare favorably with available data, while the next-to-leading order relations seem to provide only a small improvement. However, when resonance parameters are compared directly, the agreement at O(1/N_c) or O(1/N_c^2) is impressive.

This paper has not been read by Pith yet.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.