dorsal/arxiv
View Schema$g_{NK\Lambda}$ and $g_{NK\Sigma}$ from QCD Sum Rules in the $\gamma_5 \sigma_{\mu \nu}$ structure
| Authors | M. E. Bracco, F. S. Navarra, M. Nielsen |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9902007 |
| URL | https://arxiv.org/abs/nucl-th/9902007 |
| DOI | 10.1016/S0370-2693(99)00354-8 |
| Journal | Phys.Lett. B454 (1999) 346-352 |
Abstract
The NKY coupling constant for $Y = \Lambda$ and $\Sigma$ is evaluated in a QCD sum rule calculation. We study the Borel sum rule for the three point function of one pseudoscalar one nucleon and one hyperon current up to order six in the operator product expansion. The Borel transform is performed with respect to the nucleon and hyperon momenta, which are taken to be equal. We discuss and extend the result of a previous analysis in the $\rlap{/}{q}i\gamma_5$ structure and compare it with the result obtained with the use of the $\gamma_5 \sigma_{\mu \nu}$ structure. We find that the effect of pole-continuum transitions is very important in the $\rlap{/}{q}i\gamma_5$ structure and that it changes completely results obtained in previous analysis.
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"abstract": "The NKY coupling constant for $Y = \\Lambda$ and $\\Sigma$ is evaluated in a\nQCD sum rule calculation. We study the Borel sum rule for the three point\nfunction of one pseudoscalar one nucleon and one hyperon current up to order\nsix in the operator product expansion. The Borel transform is performed with\nrespect to the nucleon and hyperon momenta, which are taken to be equal. We\ndiscuss and extend the result of a previous analysis in the\n$\\rlap{/}{q}i\\gamma_5$ structure and compare it with the result obtained with\nthe use of the $\\gamma_5 \\sigma_{\\mu \\nu}$ structure. We find that the effect\nof pole-continuum transitions is very important in the $\\rlap{/}{q}i\\gamma_5$\nstructure and that it changes completely results obtained in previous analysis.",
"arxiv_id": "nucl-th/9902007",
"authors": [
"M. E. Bracco",
"F. S. Navarra",
"M. Nielsen"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1016/S0370-2693(99)00354-8",
"journal_ref": "Phys.Lett. B454 (1999) 346-352",
"title": "$g_{NK\\Lambda}$ and $g_{NK\\Sigma}$ from QCD Sum Rules in the $\\gamma_5 \\sigma_{\\mu \\nu}$ structure",
"url": "https://arxiv.org/abs/nucl-th/9902007"
},
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