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"Photoproduction of Excited Baryons in Large Nc QCD"
N.N. Scoccola
Proc. of the "II Latin American Workshop on High Energy Phenomenology", São Miguel das Missões, RS, Brazil, December 3-7, 2007.
Brazilian Journal of Physics 38(3b) (2008) 449-454
We present results for the photoproduction helicity amplitudes of excited baryons obtained in the context of the 1/Nc expansion of QCD. The results show that, in order to get a satisfactory description of the observed photoproduction amplitudes, the sub-leading corrections in 1/Nc are important. We also find that, while onebody effective operators are dominant, there is some evidence for the need of two-body effects which, in general, are not included in quark model calculations.
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