dorsal/arxiv
View Schemae+e- pair production from nucleon targets in the resonance region
| Authors | Madeleine Soyeur, Matthias F. M. Lutz |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0510077 |
| URL | https://arxiv.org/abs/nucl-th/0510077 |
| Journal | Acta Phys.Polon.B37:65-76,2006 |
Abstract
We discuss two processes, the $\pi N \to e^+e^- N$ and the $\gamma N \to e^+e^- N$ reactions, below and close to the vector meson production threshold ($1.40<\sqrt s <1.75$ GeV). The aim is to gain understanding of the coupling of vector fields (associated with $\rho^0$- and $\omega$-mesons) to low-lying baryon resonances. These couplings are not well-known and important for baryon structure studies and for dynamical descriptions of vector meson propagation in the nuclear medium. The $e^+e^-$ pair production amplitudes are determined by the $\pi N \to \rho^0 N$, $\pi N \to \omega N$, $\gamma N\to \rho^0 N$ and $\gamma N \to \omega N$ amplitudes supplemented by the Vector Meson Dominance assumption. The vector meson production amplitudes are calculated consistently using a relativistic and unitary coupled-channel approach to meson-nucleon scattering. We display results showing the importance of the quantum interference between $\rho^0$- and $\omega$-mesons in the $e^+e^-$ channel to unravel the strength of the coupling of $\rho^0$- and $\omega$-mesons to specific baryon excitations. The $\pi N \to e^+e^- N$ and $\gamma N \to e^+e^- N$ reactions underlie the more complex $\pi A \to e^+e^- X$ and $\gamma A \to e^+e^- X$ nuclear processes whose measurement is planned at GSI (with the HADES detector) and under analysis at JLab (with the CLAS detector).
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"abstract": "We discuss two processes, the $\\pi N \\to e^+e^- N$ and the $\\gamma N \\to\ne^+e^- N$ reactions, below and close to the vector meson production threshold\n($1.40\u003c\\sqrt s \u003c1.75$ GeV). The aim is to gain understanding of the coupling of\nvector fields (associated with $\\rho^0$- and $\\omega$-mesons) to low-lying\nbaryon resonances. These couplings are not well-known and important for baryon\nstructure studies and for dynamical descriptions of vector meson propagation in\nthe nuclear medium. The $e^+e^-$ pair production amplitudes are determined by\nthe $\\pi N \\to \\rho^0 N$, $\\pi N \\to \\omega N$, $\\gamma N\\to \\rho^0 N$ and\n$\\gamma N \\to \\omega N$ amplitudes supplemented by the Vector Meson Dominance\nassumption. The vector meson production amplitudes are calculated consistently\nusing a relativistic and unitary coupled-channel approach to meson-nucleon\nscattering. We display results showing the importance of the quantum\ninterference between $\\rho^0$- and $\\omega$-mesons in the $e^+e^-$ channel to\nunravel the strength of the coupling of $\\rho^0$- and $\\omega$-mesons to\nspecific baryon excitations. The $\\pi N \\to e^+e^-\n N$ and $\\gamma N \\to e^+e^- N$ reactions underlie the more complex $\\pi A \\to\ne^+e^- X$ and $\\gamma A \\to e^+e^- X$ nuclear processes whose measurement is\nplanned at GSI (with the HADES detector) and under analysis at JLab (with the\nCLAS detector).",
"arxiv_id": "nucl-th/0510077",
"authors": [
"Madeleine Soyeur",
"Matthias F. M. Lutz"
],
"categories": [
"nucl-th"
],
"journal_ref": "Acta Phys.Polon.B37:65-76,2006",
"title": "e+e- pair production from nucleon targets in the resonance region",
"url": "https://arxiv.org/abs/nucl-th/0510077"
},
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