Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-11-10
Phys.Rept.398:253-279,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages, REVTeX4, 6 figures
Scientific paper
10.1016/j.physrep.2004.05.004
Coupling constants of the pseudoscalar mesons to the octet baryons are calculated in the QCD sum rule approach. Two-point correlation function of the baryons are evaluated in a single meson state and the vacuum, which yields the designated coupling. The emphasis is on the flavor SU(3) structure of the coupling constants and reliability in extracting the coupling constants from the two-point correlation functions. We first calculate the baryon-diagonal couplings and study the reliability of the sum rule. The F/D ratio of the coupling is determined in the SU(3) limit. We further formulate the baryon-off-diagonal couplings using the projected correlation functions and the vertex functions, so that the unwanted excited states do not contaminate the sum rule. As an example, the (\pi - \Lambda - \Sigma) coupling constant is calculated and the flavor SU(3) breaking effect is studied. We find that the effect of SU(3) breaking on the (\pi - \Lambda - \Sigma) coupling constant is small.
Doi Takumi
Kondo Yoshihiko
Oka Makoto
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