dorsal/arxiv
View SchemaExchange Currents in Photoproduction of Baryon Resonances
| Authors | U. Meyer, A. J. Buchmann, Amand Faessler |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9801031 |
| URL | https://arxiv.org/abs/nucl-th/9801031 |
| DOI | 10.1016/S0370-2693(97)00840-X |
| Journal | Phys.Lett. B408 (1997) 19-24 |
Abstract
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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"abstract": "We calculate photoexcitation amplitudes for several nucleon and delta\nresonances. We use a chiral quark model including two-body exchange currents.\nThe two-body currents give important contributions. For the delta (1232) and\nthe D13 (1520) we observe that the individual exchange current contributions\nconsiderably cancel each other while in the case of the Roper resonance and the\nS11 (1535) we get a reinforcement of the two-body amplitudes. In comparison\nwith present experimental data, we obtain both for the S11 (1535) and for the\nRoper resonance an improvement with respect to the impulse approximation.",
"arxiv_id": "nucl-th/9801031",
"authors": [
"U. Meyer",
"A. J. Buchmann",
"Amand Faessler"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/S0370-2693(97)00840-X",
"journal_ref": "Phys.Lett. B408 (1997) 19-24",
"title": "Exchange Currents in Photoproduction of Baryon Resonances",
"url": "https://arxiv.org/abs/nucl-th/9801031"
},
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