dorsal/arxiv
View SchemaMass and $K\Lambda$ coupling of $N^*(1535)$
| Authors | B. C. Liu, B. S. Zou |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0503069 |
| URL | https://arxiv.org/abs/nucl-th/0503069 |
| DOI | 10.1103/PhysRevLett.96.042002 |
| Journal | Phys.Rev.Lett. 96 (2006) 042002 |
Abstract
Using resonance isobar model and effective Lagrangian approach, from recent BES results on $J/\psi\to\bar pp\eta$ and $\psi\to\bar pK^+\Lambda$, we deduce the ratio between effective coupling constants of $N^*(1535)$ to $K\Lambda$ and $p\eta$ to be $R\equiv g_{N^*(1535)K\Lambda}/g_{N^*(1535)p\eta} =1.3\pm 0.3$. With previous known value of $g_{N^*(1535)p\eta}$, the obtained new value of $g_{N^*(1535)K\Lambda}$ is shown to reproduce recent $pp\to pK^+\Lambda$ near-threshold cross section data as well. Taking into account this large $N^*K\Lambda$ coupling in the coupled channel Breit-Wigner formula for the $N^*(1535)$, its Berit-Wigner mass is found to be around 1400 MeV, much smaller than previous value of about 1535 MeV obtained without including its coupling to $K\Lambda$. The implication on the nature of $N^*(1535)$ is discussed.
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"abstract": "Using resonance isobar model and effective Lagrangian approach, from recent\nBES results on $J/\\psi\\to\\bar pp\\eta$ and $\\psi\\to\\bar pK^+\\Lambda$, we deduce\nthe ratio between effective coupling constants of $N^*(1535)$ to $K\\Lambda$ and\n$p\\eta$ to be $R\\equiv g_{N^*(1535)K\\Lambda}/g_{N^*(1535)p\\eta} =1.3\\pm 0.3$.\nWith previous known value of $g_{N^*(1535)p\\eta}$, the obtained new value of\n$g_{N^*(1535)K\\Lambda}$ is shown to reproduce recent $pp\\to pK^+\\Lambda$\nnear-threshold cross section data as well. Taking into account this large\n$N^*K\\Lambda$ coupling in the coupled channel Breit-Wigner formula for the\n$N^*(1535)$, its Berit-Wigner mass is found to be around 1400 MeV, much smaller\nthan previous value of about 1535 MeV obtained without including its coupling\nto $K\\Lambda$. The implication on the nature of $N^*(1535)$ is discussed.",
"arxiv_id": "nucl-th/0503069",
"authors": [
"B. C. Liu",
"B. S. Zou"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevLett.96.042002",
"journal_ref": "Phys.Rev.Lett. 96 (2006) 042002",
"title": "Mass and $K\\Lambda$ coupling of $N^*(1535)$",
"url": "https://arxiv.org/abs/nucl-th/0503069"
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