In the QCD sum rule approach we predict the Λ (1405) mass by choosing the π0Σ0 multiquark interpolating field. It is found that the mass is about 1.419 GeV from Π1 (q 2) sum rule which is more reliable than Πq (q 2) sum rule, where Πq (q 2) and Π1 (q …
We show that signs of pole residues λN,λΛ,λΣ,λΞ for 12+ octet baryons are identical in the QCD sum rule approach. To do this we compare signs of meson-baryon coupling constants gKNΛ,gKNΣ, gπΛΣ and gKΛΞ each other.
Using the correlation function of the axial vector mesons, we present a QCD sum rule calculation for the decay constants fπ and fK. Our calculations are only weakly dependent on the SU(3)-breaking parameter for the QCD vacuum and give the ratio fK/fπ …
The coupling constants gπΛΣ and gKΣΞ are calculated in the QCD sum rule approach using the three-point function method and taking into account the SU(3) symmetry breaking effects. The pattern of SU(3) breaking appears to be different from that based …
There have been arguments about hadronic molecules, which are weakly-bound states of two or more hadrons. We investigate the possibility of some candidates (f0 (980), a0 (980), f0 (1500), f0 (1710), etc.) using QCD sum rule approach and compare our …
g KN Λ and g KN Σ are calculated using a QCD sum rule motivated method used by Reinders, Rubinstein, and Yazaki to extract hadron couplings to Goldstone bosons. The SU (3) symmetry breaking effects are taken into account by including the …
Standard QCD sum-rule analyses of the nucleon mass give results that are inconistent with chiral perturbation theory due to an overly simple continuum ansatz on the phenomenological side of the sum rule. We show that a careful treatment of the …
By using the next-to-leading order analyses of the precision lepton-hadron deep inelastic measurements at CERN and SLAC, we extract model independent constraints on the nucleon matrix elements of the twist-4 operators. We also study a …