dorsal/arxiv
View SchemaLight-Baryon Spectroscopy and the Electromagnetic Form Factors in the Quark Model
| Authors | F. Cardarelli, E. Pace, G. Salme', S. Simula |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9809091 |
| URL | https://arxiv.org/abs/nucl-th/9809091 |
| Journal | Few Body Syst.Suppl.11:66-73,1999 |
Abstract
The momentum distributions of the constituent quarks inside the nucleon and the prominent electroproduced nucleon resonances are investigated in the two most sophisticated, available quark potential models, based respectively on the assumption of the valence + gluon dominance and on the exchange of the pseudoscalar Goldstone-bosons arising from the spontaneous breaking of chiral symmetry. It is shown that both models predict a large, similar content of high-momentum components, due to the short-range part of the interquark interaction, which affect the behaviour of both elastic and transition electromagnetic form factors at large values of the momentum transfer. The electromagnetic form factors are calculated within a relativistic approach formulated on the light-front, adopting a one-body current with constituent quark form factors. The results suggest that soft, non-perturbative effects can play a relevant role for explaining the existing data on elastic as well as transition form factors (at least) for Q**2 ~ 10 - 20 (GeV/c)**2.
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"abstract": "The momentum distributions of the constituent quarks inside the nucleon and\nthe prominent electroproduced nucleon resonances are investigated in the two\nmost sophisticated, available quark potential models, based respectively on the\nassumption of the valence + gluon dominance and on the exchange of the\npseudoscalar Goldstone-bosons arising from the spontaneous breaking of chiral\nsymmetry. It is shown that both models predict a large, similar content of\nhigh-momentum components, due to the short-range part of the interquark\ninteraction, which affect the behaviour of both elastic and transition\nelectromagnetic form factors at large values of the momentum transfer. The\nelectromagnetic form factors are calculated within a relativistic approach\nformulated on the light-front, adopting a one-body current with constituent\nquark form factors. The results suggest that soft, non-perturbative effects can\nplay a relevant role for explaining the existing data on elastic as well as\ntransition form factors (at least) for Q**2 ~ 10 - 20 (GeV/c)**2.",
"arxiv_id": "nucl-th/9809091",
"authors": [
"F. Cardarelli",
"E. Pace",
"G. Salme\u0027",
"S. Simula"
],
"categories": [
"nucl-th",
"hep-ph"
],
"journal_ref": "Few Body Syst.Suppl.11:66-73,1999",
"title": "Light-Baryon Spectroscopy and the Electromagnetic Form Factors in the Quark Model",
"url": "https://arxiv.org/abs/nucl-th/9809091"
},
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