dorsal/arxiv
View SchemaLong-range chiral dynamics of $\Lambda$-hyperon in nuclear media
| Authors | J. Martín Cámalich |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0612001 |
| URL | https://arxiv.org/abs/nucl-th/0612001 |
Abstract
We extend a chiral effective field theory approach to the $\Lambda$-nuclei interaction with the inclusion of the decuplet baryons. More precisely, we study the contributions due to the long-range two-pion exchange, with $\Sigma$ and $\Sigma^*$ baryons in the internal baryonic lines considering Nh and $\Delta$h excitations. In particular, central and spin-orbit potentials are studied. For the former, regularization is needed and physical values of the cut-off give a large attraction, becoming necessary to include the repulsion of other terms not considered here. For the latter, in a model-independent framework, the inclusion of the decuplet supports the natural explanation of the smallness of the $\Lambda$-nuclear spin-orbit term and shows the importance of the $\Sigma^*$ and $\Delta$ degrees of freedom for the hyperon-nucleus interactions.
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"abstract": "We extend a chiral effective field theory approach to the $\\Lambda$-nuclei\ninteraction with the inclusion of the decuplet baryons. More precisely, we\nstudy the contributions due to the long-range two-pion exchange, with $\\Sigma$\nand $\\Sigma^*$ baryons in the internal baryonic lines considering Nh and\n$\\Delta$h excitations. In particular, central and spin-orbit potentials are\nstudied. For the former, regularization is needed and physical values of the\ncut-off give a large attraction, becoming necessary to include the repulsion of\nother terms not considered here. For the latter, in a model-independent\nframework, the inclusion of the decuplet supports the natural explanation of\nthe smallness of the $\\Lambda$-nuclear spin-orbit term and shows the importance\nof the $\\Sigma^*$ and $\\Delta$ degrees of freedom for the hyperon-nucleus\ninteractions.",
"arxiv_id": "nucl-th/0612001",
"authors": [
"J. Mart\u00edn C\u00e1malich"
],
"categories": [
"nucl-th"
],
"title": "Long-range chiral dynamics of $\\Lambda$-hyperon in nuclear media",
"url": "https://arxiv.org/abs/nucl-th/0612001"
},
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