Scalar form factors $f_{\pi \pi }(Q^2)$ and $f_{KK}(Q^2)$ with light-cone QCD sum rules

Abstract

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. The numerical 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 good behavior at small momentum transfer. The value $f_{KK}(0)=2.21_{-0.19}^{+0.35}GeV$ is compatible with the result from the leading order chiral perturbation theory. At large momentum transfer with $Q^2>6Ge{V}^2$, 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 $\frac{1}{Q^2}$.

22 pages, 13 figures, slight modification

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• Vector form factor in K_l3 semileptonic decay with two flavors of dynamical domain-wall quarks
• Analysis of the $\Sigma -n$ form factors with light-cone QCD sum rules
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Cited by in corpus (2)

• Analysis of the vertex $D^{\ast }{D}^{\ast }\rho$ with the light-cone QCD sum rules
• Electromagnetic form-factor of the $\pi$ meson with light-cone QCD sum rules