Photoproduction of of l=1 Baryons: Quark Model versus Large N_c

Details Photoproduction of of l=1 Baryons: Quark Model versus Large N_c Photoproduction of of l=1 Baryons: Quark Model versus Large N_c

1998-04-16

arxiv.org/abs/hep-ph/9804304v1

Phys.Rev. D58 (1998) 053005

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages LaTeX, four EPS figures

Scientific paper

10.1103/PhysRevD.58.053005

We consider the electromagnetic decays of the orbitally-excited SU(6) 70-plet baryons, to compare the predictions of the naive quark model with those of large-N_c QCD. The helicity amplitudes measured in N^* photoproduction are computed in a large-N_c effective field theory, based on a Hartree approximation, and the amplitudes are fit to the current experimental data. Our results indicate that the success of the naive quark model predictions cannot be explained by large-N_c arguments alone. This is consistent with the conclusions of an earlier study of the N^*\to N\pi decays, that utilized the same approach.

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