dorsal/arxiv
View SchemaThe Role of 5-quark Components on the Nucleon Form Factors
| Authors | Q. B. Li, D. O. Riska |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0702049 |
| URL | https://arxiv.org/abs/nucl-th/0702049 |
| DOI | 10.1016/j.nuclphysa.2007.05.002 |
| Journal | Nucl.Phys.A791:406-421,2007 |
Abstract
The covariant quark model is shown to allow a phenomenological description of the neutron electric form factor, G_E^n(Q^2), in the impulse approximation, provided that the wave function contains minor (~ 3 %) admixtures of the lowest sea-quark configurations. While that form factor is not very sensitive to whether the \bar q in the qqqq\bar q component is in the P-state or in the S-state, the calculated nucleon magnetic form factors are much closer to the empirical values in the case of the former configuration. In the case of the electric form factor of the proton, G_E^p(Q^2), a zero appears in the impulse approximation close to 9 GeV^2, when the \bar q is in the P-state. That configuration, which may be interpreted as a pion loop ("cloud") fluctuation, also leads to a clearly better description of the nucleon magnetic moments. When the amplitude of the sea-quark admixtures are set so as to describe the electric form factor of the neutron, the qqqq\bar q admixtures have the phenomenologically desirable feature, that the electric form factor of the proton falls at a more rapid rate with momentum transfer than the magnetic form factor.
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"abstract": "The covariant quark model is shown to allow a phenomenological description of\nthe neutron electric form factor, G_E^n(Q^2), in the impulse approximation,\nprovided that the wave function contains minor (~ 3 %) admixtures of the lowest\nsea-quark configurations. While that form factor is not very sensitive to\nwhether the \\bar q in the qqqq\\bar q component is in the P-state or in the\nS-state, the calculated nucleon magnetic form factors are much closer to the\nempirical values in the case of the former configuration. In the case of the\nelectric form factor of the proton, G_E^p(Q^2), a zero appears in the impulse\napproximation close to 9 GeV^2, when the \\bar q is in the P-state. That\nconfiguration, which may be interpreted as a pion loop (\"cloud\") fluctuation,\nalso leads to a clearly better description of the nucleon magnetic moments.\nWhen the amplitude of the sea-quark admixtures are set so as to describe the\nelectric form factor of the neutron, the qqqq\\bar q admixtures have the\nphenomenologically desirable feature, that the electric form factor of the\nproton falls at a more rapid rate with momentum transfer than the magnetic form\nfactor.",
"arxiv_id": "nucl-th/0702049",
"authors": [
"Q. B. Li",
"D. O. Riska"
],
"categories": [
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],
"doi": "10.1016/j.nuclphysa.2007.05.002",
"journal_ref": "Nucl.Phys.A791:406-421,2007",
"title": "The Role of 5-quark Components on the Nucleon Form Factors",
"url": "https://arxiv.org/abs/nucl-th/0702049"
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