dorsal/arxiv
View SchemaThe quark-photon vertex and meson electromagnetic form factors
| Authors | P. Maris, P. C. Tandy |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9908045 |
| URL | https://arxiv.org/abs/nucl-th/9908045 |
| DOI | 10.1016/S0375-9474(99)00627-2 |
| Journal | Nucl.Phys. A663 (2000) 401-404 |
Abstract
The ladder Bethe-Salpeter solution for the dressed photon-quark vertex is used to study the low-momentum behavior of the pion electromagnetic and the $\gamma^\star \pi^0 \gamma$ transition form factors. With model parameters previously fixed by light meson masses and decay constants, the low-momentum slope of both form factors is in excellent agreement with the data. In comparison, the often-used Ball-Chiu Ansatz for the vertex is found to be deficient; less than half of the obtained $r_\pi^2$ is generated by that Ansatz while the remainder of the charge radius could be attributed to the tail of the $\rho$ resonance.
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"abstract": "The ladder Bethe-Salpeter solution for the dressed photon-quark vertex is\nused to study the low-momentum behavior of the pion electromagnetic and the\n$\\gamma^\\star \\pi^0 \\gamma$ transition form factors. With model parameters\npreviously fixed by light meson masses and decay constants, the low-momentum\nslope of both form factors is in excellent agreement with the data. In\ncomparison, the often-used Ball-Chiu Ansatz for the vertex is found to be\ndeficient; less than half of the obtained $r_\\pi^2$ is generated by that Ansatz\nwhile the remainder of the charge radius could be attributed to the tail of the\n$\\rho$ resonance.",
"arxiv_id": "nucl-th/9908045",
"authors": [
"P. Maris",
"P. C. Tandy"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1016/S0375-9474(99)00627-2",
"journal_ref": "Nucl.Phys. A663 (2000) 401-404",
"title": "The quark-photon vertex and meson electromagnetic form factors",
"url": "https://arxiv.org/abs/nucl-th/9908045"
},
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