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artículo con referato
"Analysis of Negative Parity Baryon Photoproduction Amplitudes in the 1/Nc Expansion"
N.N. Scoccola, J.L. Goity and N. Matagne
Phys. Lett. B 663(3) (2008) 222-227
We study the photoproduction helicity amplitudes of negative parity baryons in the context of the 1/Nc expansion of QCD. A complete analysis to next-to-leading order is carried out. The results show sub-leading effects to be within the magnitude expected from the 1/Nc power counting. They also show significant deviations from the quark model, in particular the need for 2-body effects.
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