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artículo con referato
"Photoproduction of Positive-Parity Excited Baryons in the 1/Nc Expansion of QCD"
J.L. Goity and N.N. Scoccola
Phys. Rev. Lett. 99(6) (2007) 062002/1-4
We analyze the photoproduction helicity amplitudes for positive-parity excited baryons in the context of the 1/Nc expansion of QCD. The results show that subleading corrections in 1/Nc are important and that, while one-body effective operators are dominant, there is some evidence for the need for two-body effects.
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