dorsal/arxiv
View SchemaCoupled-channel study of baryon resonances with charm
| Authors | Julian Hofmann, Matthias F. M. Lutz |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0510091 |
| URL | https://arxiv.org/abs/nucl-th/0510091 |
Abstract
Identifying a zero-range exchange of vector mesons as the driving force for the s-wave scattering of pseudo-scalar mesons off the baryon ground states, a rich spectrum of molecules is formed. We argue that chiral symmetry and large-$N_c$ considerations determine that part of the interaction which generates the spectrum. A bound state with exotic quantum numbers is predicted at mass 2.78 GeV. It couples strongly to the $(\bar D_s N),(\bar D \Lambda ),(\bar D \Sigma)$ channels. A further charm minus-one system is predicted at mass 2.84 GeV as a result of $(\bar D_s \Lambda), (\bar D \Xi)$ interactions. The two so far observed s-wave baryons with charm one are recovered. We argue that the $\Lambda_c(2880)$ is not a s-wave state. In addition to those states we predict the existence of about ten narrow s-wave baryon states with masses below 3 GeV. A triplet of crypto-exotic states decaying dominantly into channels with an $\eta'$ is obtained with masses 4.24 GeV and 4.44 GeV.
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"abstract": "Identifying a zero-range exchange of vector mesons as the driving force for\nthe s-wave scattering of pseudo-scalar mesons off the baryon ground states, a\nrich spectrum of molecules is formed. We argue that chiral symmetry and\nlarge-$N_c$ considerations determine that part of the interaction which\ngenerates the spectrum. A bound state with exotic quantum numbers is predicted\nat mass 2.78 GeV. It couples strongly to the $(\\bar D_s N),(\\bar D \\Lambda\n),(\\bar D \\Sigma)$ channels. A further charm minus-one system is predicted at\nmass 2.84 GeV as a result of $(\\bar D_s \\Lambda), (\\bar D \\Xi)$ interactions.\nThe two so far observed s-wave baryons with charm one are recovered. We argue\nthat the $\\Lambda_c(2880)$ is not a s-wave state. In addition to those states\nwe predict the existence of about ten narrow s-wave baryon states with masses\nbelow 3 GeV. A triplet of crypto-exotic states decaying dominantly into\nchannels with an $\\eta\u0027$ is obtained with masses 4.24 GeV and 4.44 GeV.",
"arxiv_id": "nucl-th/0510091",
"authors": [
"Julian Hofmann",
"Matthias F. M. Lutz"
],
"categories": [
"nucl-th"
],
"title": "Coupled-channel study of baryon resonances with charm",
"url": "https://arxiv.org/abs/nucl-th/0510091"
},
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