dorsal/arxiv
View SchemaConsistent analysis of the reaction $\gamma p \to p \eta^\prime$ and $pp \to pp\eta^\prime$
| Authors | K. Nakayama, H. Haberzettl |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0401030 |
| URL | https://arxiv.org/abs/nucl-th/0401030 |
| DOI | 10.1103/PhysRevC.69.065212 |
| Journal | Phys.Rev. C69 (2004) 065212 |
Abstract
The production of $\eta'$ mesons in the reactions $\gamma p\to p\eta'$ and $pp\to pp\eta'$ is described consistently within a relativistic meson exchange model of hadronic interactions. The photoproduction can be described quite well over the entire energy range of available data by considering an $S_{11}$ and a $P_{11}$ resonance, in addition to the $t$-channel mesonic current. The observed angular distribution is due to the interference between the $t$-channel and the nucleon resonance $s$- and $u$-channel contributions. Our analysis yields positions close to 1650 MeV and 1870 MeV for the $S_{11}$ and $P_{11}$ resonances, respectively. We argue that, at present, identifying these states with the known $S_{11}(1650)$ resonance and the missing $P_{11}$ resonance predicted at 1880 MeV, respectively, would be premature. It is found that the nucleonic current is relatively small and that the $NN\eta^\prime$ coupling constant cannot be much larger than $g_{NN\eta^\prime}=3$. As for the $p p \to p p \eta^\prime$ reaction, different current contributions are constrained by a combined analysis of this and the photoproduction reaction. Difficulties to simultaneously account for the 47-MeV and 144-MeV angular distributions measured by the COSY-11 and DISTO collaborations, respectively, are addressed.
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"abstract": "The production of $\\eta\u0027$ mesons in the reactions $\\gamma p\\to p\\eta\u0027$ and\n$pp\\to pp\\eta\u0027$ is described consistently within a relativistic meson exchange\nmodel of hadronic interactions. The photoproduction can be described quite well\nover the entire energy range of available data by considering an $S_{11}$ and a\n$P_{11}$ resonance, in addition to the $t$-channel mesonic current. The\nobserved angular distribution is due to the interference between the\n$t$-channel and the nucleon resonance $s$- and $u$-channel contributions. Our\nanalysis yields positions close to 1650 MeV and 1870 MeV for the $S_{11}$ and\n$P_{11}$ resonances, respectively. We argue that, at present, identifying these\nstates with the known $S_{11}(1650)$ resonance and the missing $P_{11}$\nresonance predicted at 1880 MeV, respectively, would be premature. It is found\nthat the nucleonic current is relatively small and that the $NN\\eta^\\prime$\ncoupling constant cannot be much larger than $g_{NN\\eta^\\prime}=3$. As for the\n$p p \\to p p \\eta^\\prime$ reaction, different current contributions are\nconstrained by a combined analysis of this and the photoproduction reaction.\nDifficulties to simultaneously account for the 47-MeV and 144-MeV angular\ndistributions measured by the COSY-11 and DISTO collaborations, respectively,\nare addressed.",
"arxiv_id": "nucl-th/0401030",
"authors": [
"K. Nakayama",
"H. Haberzettl"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.69.065212",
"journal_ref": "Phys.Rev. C69 (2004) 065212",
"title": "Consistent analysis of the reaction $\\gamma p \\to p \\eta^\\prime$ and $pp \\to pp\\eta^\\prime$",
"url": "https://arxiv.org/abs/nucl-th/0401030"
},
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