dorsal/arxiv
View SchemaPoint-Form Approach to Baryon Structure
| Authors | W. Plessas |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0408067 |
| URL | https://arxiv.org/abs/nucl-th/0408067 |
| DOI | 10.1142/9789812702272_0028 |
Abstract
A critical discussion is given of the results for baryon electromagnetic and axial form factors obtained from relativistic constituent quark models in the framework of Poincar\'e-invariant quantum mechanics. The primary emphasis lies on the point-form approach. First we summarize the predictions of the Goldstone-boson-exchange constituent quark model for the electroweak nucleon structure when using a spectator-model current in point form. Then the influences of different dynamics inherent in various kinds of constituent quark models (Goldstone-boson-exchange, one-gluon-exchange, instanton-induced interactions) are discussed. Finally the point-form results are compared to analogous predictions calculated in instant form. Relativistic effects are always of sizeable magnitude. A nonrelativistic approach is ruled out. The instant-form results are afflicted with severe shortcomings. In the spectator-model approximation for the current, only the point-form results appear to be reasonable a-priori. In fact, the corresponding quark model predictions provide a surprisingly good description of all elastic electroweak observables in close agreement with existing experimental data, specifically for the Goldstone-boson-exchange constituent quark model.
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"abstract": "A critical discussion is given of the results for baryon electromagnetic and\naxial form factors obtained from relativistic constituent quark models in the\nframework of Poincar\\\u0027e-invariant quantum mechanics. The primary emphasis lies\non the point-form approach. First we summarize the predictions of the\nGoldstone-boson-exchange constituent quark model for the electroweak nucleon\nstructure when using a spectator-model current in point form. Then the\ninfluences of different dynamics inherent in various kinds of constituent quark\nmodels (Goldstone-boson-exchange, one-gluon-exchange, instanton-induced\ninteractions) are discussed. Finally the point-form results are compared to\nanalogous predictions calculated in instant form. Relativistic effects are\nalways of sizeable magnitude. A nonrelativistic approach is ruled out. The\ninstant-form results are afflicted with severe shortcomings. In the\nspectator-model approximation for the current, only the point-form results\nappear to be reasonable a-priori. In fact, the corresponding quark model\npredictions provide a surprisingly good description of all elastic electroweak\nobservables in close agreement with existing experimental data, specifically\nfor the Goldstone-boson-exchange constituent quark model.",
"arxiv_id": "nucl-th/0408067",
"authors": [
"W. Plessas"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1142/9789812702272_0028",
"title": "Point-Form Approach to Baryon Structure",
"url": "https://arxiv.org/abs/nucl-th/0408067"
},
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