20 00 K l 4 decays Bing
نویسنده
چکیده
An effective theory of large NC QCD of mesons has been used to study six Kl4 decay modes. It has been found that the matrix elements of the axial-vector current dominate the Kl4 decays. PCAC is satisfied. A relationship between three form factors of axial-vector current has been found. Non-zero phase shifts are originated in ρ → ππ. The decay rates are calculated in the chiral limit. In this study there is no adjustable parameter.
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The decays of Υ(1s) → γ(η, η) are studied by an approach which has successfully predicted the ratio Γ(J/ψ→γη ) Γ(J/ψ→γη) . Strong dependence on quark mass has been found in the decays (J/ψ,Υ(1s)) → γ(η, η). Very small decay rates of Υ(1s) → γ(η, η) are
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