dorsal/arxiv
View Schema$pp\to pp\omega$ reaction near threshold
| Authors | N. Kaiser |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9907114 |
| URL | https://arxiv.org/abs/nucl-th/9907114 |
| DOI | 10.1103/PhysRevC.60.057001 |
| Journal | Phys.Rev. C60 (1999) 057001 |
Abstract
We analyze the total cross section data for $pp \to pp\omega$ near threshold measured recently at SATURNE. Using an effective range approximation for the on-shell $pp$ S-wave final state interaction we extract from these data the modulus $|\Omega| = 0.53$ fm$^4$ of the threshold transition amplitude $\Omega$. We present a calculation of various (tree-level) meson exchange diagrams contributing to $\Omega$. It is essential that $\omega$-emission from the anomalous $\omega\rho\pi$-vertex interferes destructively with $\omega$-emission from the proton lines. The contribution of scalar $\sigma$-meson exchange to $\Omega$ turns out to be negligibly small. Without introducing off-shell meson-nucleon form factors the experimental value $|\Omega|=0.53$ fm$^4$ can be reproduced with an $\omega N$-coupling constant of $g_{\omega N}=10.7$. The results of the present approach agree qualitatively with the J\"ulich model. We also perform a combined analysis of the reactions $pp\to pp\pi^0, pn\pi^+, pp\eta, pp\omega$ and $pn\to pn\eta$ near threshold.
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"abstract": "We analyze the total cross section data for $pp \\to pp\\omega$ near threshold\nmeasured recently at SATURNE. Using an effective range approximation for the\non-shell $pp$ S-wave final state interaction we extract from these data the\nmodulus $|\\Omega| = 0.53$ fm$^4$ of the threshold transition amplitude\n$\\Omega$. We present a calculation of various (tree-level) meson exchange\ndiagrams contributing to $\\Omega$. It is essential that $\\omega$-emission from\nthe anomalous $\\omega\\rho\\pi$-vertex interferes destructively with\n$\\omega$-emission from the proton lines. The contribution of scalar\n$\\sigma$-meson exchange to $\\Omega$ turns out to be negligibly small. Without\nintroducing off-shell meson-nucleon form factors the experimental value\n$|\\Omega|=0.53$ fm$^4$ can be reproduced with an $\\omega N$-coupling constant\nof $g_{\\omega N}=10.7$. The results of the present approach agree qualitatively\nwith the J\\\"ulich model. We also perform a combined analysis of the reactions\n$pp\\to pp\\pi^0, pn\\pi^+, pp\\eta, pp\\omega$ and $pn\\to pn\\eta$ near threshold.",
"arxiv_id": "nucl-th/9907114",
"authors": [
"N. Kaiser"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.60.057001",
"journal_ref": "Phys.Rev. C60 (1999) 057001",
"title": "$pp\\to pp\\omega$ reaction near threshold",
"url": "https://arxiv.org/abs/nucl-th/9907114"
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