Photoproduction of positive-parity excited baryons in the 1/Nc expansion of QCD.
We analyze the photoproduction helicity amplitudes for positive-parity excited baryons in the context of the 1/N(c) expansion of QCD. The results show that subleading corrections in 1/N(c) 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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J L
JL
Department of Physics, Hampton University, Hampton, Virginia 23668, USA.
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