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In this article, we calculate the scalar form-factors $f_{\pi\pi}(Q^2)$ and$f_{KK}(Q^2)$ in the framework of the light-cone QCD sum rules approach. Thenumerical value of the $f_{\pi\pi}(Q^2)$ changes quickly with variation of$Q^2$ near zero momentum transfer, while the $f_{KK}(Q^2)$ has rather goodbehavior at small momentum transfer. The value $f_{KK}(0) =2.21^{+0.35}_{-0.19}GeV$ is compatible with the result from the leading order chiral perturbationtheory. At large momentum transfer with $Q^2> 6GeV^2$, the form-factor$f_{\pi\pi}(Q^2)$ takes up the asymptotic behavior $\frac{1}{Q^2}$approximately, while the $f_{KK}(Q^2)$ decreases more quickly than$\frac{1}{Q^2}$.Comment: 22 pages, 13 figures, slight modificatio

Scalar form-factorsfππ(Q2) andfKK(Q2) with light-cone QCD sum rules

Scalar form-factorsf_ππ(Q²) andf_KK(Q²) with light-cone QCD sum rules