dorsal/arxiv
View Schema$\Lambda(1520)$ and $\Sigma(1385)$ in the nuclear medium
| Authors | M. Kaskulov, E. Oset |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0509088 |
| URL | https://arxiv.org/abs/nucl-th/0509088 |
| DOI | 10.1103/PhysRevC.73.045213 |
| Journal | Phys.Rev.C73:045213,2006 |
Abstract
Recent studies of the $\Lambda(1520)$ resonance within chiral unitary theory with coupled channels find the resonance as a dynamically generated state from the interaction of the decuplet of baryons and the octet of mesons, essentially a quasibound state of $\pi \Sigma^*(1385)$ in this case, although the coupling of the $\Lambda(1520)$ to the $\bar{K}N$ and $\pi \Sigma$ makes this picture only approximate. The $\pi \Sigma^*(1385)$ decay channel of the $\Lambda(1520)$ is forbidden in free space for the nominal mass of the $\Sigma^*(1385)$, but the coupling of the $\pi$ to $ph$ components in the nuclear medium opens new decay channels of the $\Lambda(1520)$ in the nucleus and produces a much larger width. Together with medium modifications of the $\bar{K}N$ and $\pi \Sigma$ decay channels, the final width of the $\Lambda(1520)$ at nuclear matter density is more than five times bigger than the free one. We perform the calculations by dressing simultaneously the $\Lambda(1520)$ and the $\Sigma^*(1385)$ resonances, finding moderate changes in the mass but substantial ones in the width of both resonances.
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"abstract": "Recent studies of the $\\Lambda(1520)$ resonance within chiral unitary theory\nwith coupled channels find the resonance as a dynamically generated state from\nthe interaction of the decuplet of baryons and the octet of mesons, essentially\na quasibound state of $\\pi \\Sigma^*(1385)$ in this case, although the coupling\nof the $\\Lambda(1520)$ to the $\\bar{K}N$ and $\\pi \\Sigma$ makes this picture\nonly approximate. The $\\pi \\Sigma^*(1385)$ decay channel of the $\\Lambda(1520)$\nis forbidden in free space for the nominal mass of the $\\Sigma^*(1385)$, but\nthe coupling of the $\\pi$ to $ph$ components in the nuclear medium opens new\ndecay channels of the $\\Lambda(1520)$ in the nucleus and produces a much larger\nwidth. Together with medium modifications of the $\\bar{K}N$ and $\\pi \\Sigma$\ndecay channels, the final width of the $\\Lambda(1520)$ at nuclear matter\ndensity is more than five times bigger than the free one. We perform the\ncalculations by dressing simultaneously the $\\Lambda(1520)$ and the\n$\\Sigma^*(1385)$ resonances, finding moderate changes in the mass but\nsubstantial ones in the width of both resonances.",
"arxiv_id": "nucl-th/0509088",
"authors": [
"M. Kaskulov",
"E. Oset"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.73.045213",
"journal_ref": "Phys.Rev.C73:045213,2006",
"title": "$\\Lambda(1520)$ and $\\Sigma(1385)$ in the nuclear medium",
"url": "https://arxiv.org/abs/nucl-th/0509088"
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