Exchange Currents in Photoproduction of Baryon Resonances

Details Exchange Currents in Photoproduction of Baryon Resonances Exchange Currents in Photoproduction of Baryon Resonances

1998-01-19

arxiv.org/abs/nucl-th/9801031v1

Phys.Lett. B408 (1997) 19-24

Physics

Nuclear Physics

Nuclear Theory

9 pages, 1 figure

Scientific paper

10.1016/S0370-2693(97)00840-X

We calculate photoexcitation amplitudes for several nucleon and delta resonances. We use a chiral quark model including two-body exchange currents. The two-body currents give important contributions. For the delta (1232) and the D13 (1520) we observe that the individual exchange current contributions considerably cancel each other while in the case of the Roper resonance and the S11 (1535) we get a reinforcement of the two-body amplitudes. In comparison with present experimental data, we obtain both for the S11 (1535) and for the Roper resonance an improvement with respect to the impulse approximation.

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