arXiv:hep-ph/0212043·v1·High Energy Physics — Phenomenology
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.)
Abstract
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.
Comments: 4 pages, Talk given at XVI International Conference on Particles and Nuclei (PANIC02), Osaka, Japan, Sep.30 - Oct.4, 2002