dorsal/arxiv
View SchemaDynamical coupled-channel approach to hadronic and electromagnetic production of kaon-hyperon on the proton
| Authors | B. Julia-Diaz, B. Saghai, T. -S. H. Lee, F. Tabakin |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0601053 |
| URL | https://arxiv.org/abs/nucl-th/0601053 |
| DOI | 10.1103/PhysRevC.73.055204 |
| Journal | Phys.Rev. C73 (2006) 055204 |
Abstract
A dynamical coupled-channel formalism for processes $\pi N \to KY$ and $\gamma N \to KY$ is presented which provides a comprehensive investigation of recent data on the $\gamma p \to K^+ \Lambda$ reaction. The non-resonant interactions within the subspace $KY\oplus\pi N$ are derived from effective Lagrangians, using a unitary transformation method. The calculations of photoproduction amplitudes are simplified by casting the coupled-channel equations into a form such that the empirical $\gamma N \to \pi N$ amplitudes are input and only the parameters associated with the $KY$ channel are determined by performing $\chi^2$-fits to all of the available data for $\pi^- p \to K^\circ\Lambda, K^\circ\Sigma^\circ$ and $\gamma p \to K^+\Lambda$. Good agreement between our models and those data are obtained. In the fits to $\pi N \to KY$ channels, most of the parameters are constrained within $\pm 20%$ of the values given by the Particle Data Group and/or quark model predictions, while for $\gamma p \to K^+ \Lambda$ parameters, ranges compatible with broken $SU(6)\otimes O(3)$ symmetry are imposed. The main reaction mechanisms in $K^+ \Lambda$ photoproduction are singled out and issues related to newly suggested resonances $S_{11}$, $P_{13}$, and $D_{13}$ are studied. Results illustrating the importance of using a coupled-channel treatment are reported. Meson cloud effects on the $\gamma N \to N^*$ transitions are also discussed.
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"abstract": "A dynamical coupled-channel formalism for processes $\\pi N \\to KY$ and\n$\\gamma N \\to KY$ is presented which provides a comprehensive investigation of\nrecent data on the $\\gamma p \\to K^+ \\Lambda$ reaction. The non-resonant\ninteractions within the subspace $KY\\oplus\\pi N$ are derived from effective\nLagrangians, using a unitary transformation method. The calculations of\nphotoproduction amplitudes are simplified by casting the coupled-channel\nequations into a form such that the empirical $\\gamma N \\to \\pi N$ amplitudes\nare input and only the parameters associated with the $KY$ channel are\ndetermined by performing $\\chi^2$-fits to all of the available data for $\\pi^-\np \\to K^\\circ\\Lambda, K^\\circ\\Sigma^\\circ$ and $\\gamma p \\to K^+\\Lambda$. Good\nagreement between our models and those data are obtained. In the fits to $\\pi N\n\\to KY$ channels, most of the parameters are constrained within $\\pm 20%$ of\nthe values given by the Particle Data Group and/or quark model predictions,\nwhile for $\\gamma p \\to K^+ \\Lambda$ parameters, ranges compatible with broken\n$SU(6)\\otimes O(3)$ symmetry are imposed. The main reaction mechanisms in $K^+\n\\Lambda$ photoproduction are singled out and issues related to newly suggested\nresonances $S_{11}$, $P_{13}$, and $D_{13}$ are studied. Results illustrating\nthe importance of using a coupled-channel treatment are reported. Meson cloud\neffects on the $\\gamma N \\to N^*$ transitions are also discussed.",
"arxiv_id": "nucl-th/0601053",
"authors": [
"B. Julia-Diaz",
"B. Saghai",
"T. -S. H. Lee",
"F. Tabakin"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.73.055204",
"journal_ref": "Phys.Rev. C73 (2006) 055204",
"title": "Dynamical coupled-channel approach to hadronic and electromagnetic production of kaon-hyperon on the proton",
"url": "https://arxiv.org/abs/nucl-th/0601053"
},
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