Photo-production of Positive Parity Excited Baryons in the 1/Nc Expansion of QCD
Abstract
We analyze the photo-production helicity amplitudes for the positive parity excited baryons in the context of the 1/Nc expansion of QCD. The results show that sub-leading corrections in 1/Nc are important and that, while 1-body effective operators are dominant, there is some evidence for the need of 2-body effects.
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