dorsal/arxiv
View SchemaViolation of the $\Delta$I=1/2 rule in the nonmesonic weak decay of $\Lambda$ hypernuclei
| Authors | A. Parreño, A. Ramos, C. Bennhold, K. Maltman |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9712045 |
| URL | https://arxiv.org/abs/nucl-th/9712045 |
| DOI | 10.1016/S0375-9474(98)00292-9 |
| Journal | Nucl.Phys. A639 (1998) 333-336 |
Abstract
Violations of the $\Delta$I=1/2 rule are investigated in the nonmesonic weak hypernuclear decay using a weak $\Lambda$N$\to$NN transition potential based on meson exchange. While the weak $\Delta$I=3/2 matrix elements of baryons with pseudoscalar mesons are known to be very small, the same matrix elements of baryons with vector mesons, evaluated in the factorization approximation, are found to be significant. Within the uncertainties of the factorization approximation we find that the total rate increases by at most 6% lying within the error bars of the more recent experimental result. The neutron- to proton-induced rate, on the other hand, can change by up to a factor of two, while the asymmetry parameter is strongly affected as well.
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"abstract": "Violations of the $\\Delta$I=1/2 rule are investigated in the nonmesonic weak\nhypernuclear decay using a weak $\\Lambda$N$\\to$NN transition potential based on\nmeson exchange. While the weak $\\Delta$I=3/2 matrix elements of baryons with\npseudoscalar mesons are known to be very small, the same matrix elements of\nbaryons with vector mesons, evaluated in the factorization approximation, are\nfound to be significant. Within the uncertainties of the factorization\napproximation we find that the total rate increases by at most 6% lying within\nthe error bars of the more recent experimental result. The neutron- to\nproton-induced rate, on the other hand, can change by up to a factor of two,\nwhile the asymmetry parameter is strongly affected as well.",
"arxiv_id": "nucl-th/9712045",
"authors": [
"A. Parre\u00f1o",
"A. Ramos",
"C. Bennhold",
"K. Maltman"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/S0375-9474(98)00292-9",
"journal_ref": "Nucl.Phys. A639 (1998) 333-336",
"title": "Violation of the $\\Delta$I=1/2 rule in the nonmesonic weak decay of $\\Lambda$ hypernuclei",
"url": "https://arxiv.org/abs/nucl-th/9712045"
},
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