dorsal/arxiv
View SchemaNon-mesonic Weak Decays of Light Hypernuclei in the Direct Quark and the One-Pion Exchange Mechanisms
| Authors | T. Inoue, M. Oka, T. Motoba, K. Itonaga |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9708041 |
| URL | https://arxiv.org/abs/nucl-th/9708041 |
| DOI | 10.1016/S0375-9474(98)00005-0 |
| Journal | Nucl.Phys.A633:312-330,1998 |
Abstract
Contributions of the direct quark mechanism are studied in the nonmesonic weak decays of light hypernuclei. The $\Lambda N \to NN$ transition is described by the one pion exchange mechanism and the direct quark mechanism, induced by the four-quark vertices in the effective weak Hamiltonian. By employing a realistic wave function of the $\Lambda$ inside the hypernuclei, nonmesonic decay rates of $^4_{\Lambda}$H, $^4_{\Lambda}$He, and $^5_{\Lambda}$He are calculated. The results show that the direct quark mechanism is significantly large and gives a large $\Delta I =3/2$ contribution in the J=0 channel. The relative phase between the one-pion exchange and the direct-quark contributions is determined so that the effective weak Hamiltonian for quarks give both of them consistently. We find that the sum of these two contributions reproduce the current available experimental data fairly well.
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"abstract": "Contributions of the direct quark mechanism are studied in the nonmesonic\nweak decays of light hypernuclei. The $\\Lambda N \\to NN$ transition is\ndescribed by the one pion exchange mechanism and the direct quark mechanism,\ninduced by the four-quark vertices in the effective weak Hamiltonian. By\nemploying a realistic wave function of the $\\Lambda$ inside the hypernuclei,\nnonmesonic decay rates of $^4_{\\Lambda}$H, $^4_{\\Lambda}$He, and\n$^5_{\\Lambda}$He are calculated. The results show that the direct quark\nmechanism is significantly large and gives a large $\\Delta I =3/2$ contribution\nin the J=0 channel. The relative phase between the one-pion exchange and the\ndirect-quark contributions is determined so that the effective weak Hamiltonian\nfor quarks give both of them consistently. We find that the sum of these two\ncontributions reproduce the current available experimental data fairly well.",
"arxiv_id": "nucl-th/9708041",
"authors": [
"T. Inoue",
"M. Oka",
"T. Motoba",
"K. Itonaga"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1016/S0375-9474(98)00005-0",
"journal_ref": "Nucl.Phys.A633:312-330,1998",
"title": "Non-mesonic Weak Decays of Light Hypernuclei in the Direct Quark and the One-Pion Exchange Mechanisms",
"url": "https://arxiv.org/abs/nucl-th/9708041"
},
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