Hyperon-nucleon coupling from QCD sum rules

Details Hyperon-nucleon coupling from QCD sum rules Hyperon-nucleon coupling from QCD sum rules

1999-08-24

arxiv.org/abs/hep-ph/9908452v1

Nucl.Phys.Proc.Suppl. 86 (2000) 417-420

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, espcrc2.sty included. Talk presented at QCD99, Montpellier, France (to appear in Nucl.Phys.B Proc.Suppl.)

Scientific paper

10.1016/S0920-5632(00)00597-1

The NKY coupling constant for $Y = \Lambda$ and $\Sigma$ is evaluated in a QCD sum rule calculation. 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 a huge violation of the SU(3) symmetry in the $\gamma_5 \sigma_{\mu \nu}$ structure.

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