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arxiv: hep-ph/0212043 · v1 · submitted 2002-12-03 · ✦ hep-ph · nucl-th

The F/D Ratio and Meson-Baryon Couplings from QCD Sum Rules

Takumi Doi (1) , Hungchong Kim (2) , Yoshihiko Kondo (3) , Makoto Oka (1) ((1) Tokyo Inst. Tech , (2) Yonsei Univ. (3) Kokugakuin Univ.) This is my paper
classification ✦ hep-ph nucl-th
keywords couplingscorrelationfunctionratioanalyzeapproachbaryonsbreaking
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Coupling constants of the pseudoscalar mesons to the octet baryons are computed in the QCD sum rule approach. The pi-NN, eta-NN, pi-XiXi, eta-XiXi, pi-SigmaSigma, eta-SigmaSigma as well as pi-Lambda-Sigma couplings are studied. Determining the pertinent Dirac structure in the correlation function, we analyze the couplings in the SU(3) limit. We find the F/D ratio to be \sim 0.6-0.8 that is consistent with the SU(6) value. We also estimate the SU(3) breaking effect using a projected correlation function method.

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