Kaon-baryon coupling constants in the QCD sum rule approach

Details Kaon-baryon coupling constants in the QCD sum rule approach Kaon-baryon coupling constants in the QCD sum rule approach

2000-03-11

arxiv.org/abs/nucl-th/0003024v2

Phys.Rev. C62 (2000) 025204

Physics

Nuclear Physics

Nuclear Theory

revtex, 10 pages, 2 ps figures; substantial revision, results changed, to be published in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.62.025204

We improve our previous QCD sum rule calculation on G(KN\Lambda) and G(KN\Sigma) coupling constants by including the contributions from higher dimensional condensates, <\bar{q} g_s \sigma \cdot G q> and <\bar{q}q> <(\alpha_s /\pi) G^2>, in the OPE. It is found that the contribution of these condensates is non-negligible compared to that of the quark condensates. Using a best-fit analysis we find |G(KN\Lambda)| = 2.49 $\pm$ 1.25 and |G(KN\Sigma)| = 0.395 $\pm$ 0.377.

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