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The decay constant of $K_0^*(1430)$ is the key quantity to determine theproduction rate of $K_0^*(1430)$ in $\tau$ decays. By assuming $K_0^*(1430)$ isthe lowest scalar bound state of $s\bar{q}$, the decay constant can becalculated reliably in QCD sum rule. Then the decay branching ratio of $\tau\toK_0^*(1430)\nu$ is predicted to be about $(7.9\pm 3.1)\times 10^{-5}$. If thisbranching ratio can be measured by experiment, it should be helpful to makeclear the structure of $K_0^*(1430)$.Comment: 4 pages, Accepted for pubication in Mod. Phys. Lett.

TESTING THE STRUCTURE OF THE SCALAR MESON $K_0^*(1430)$ IN $\tau\to K_0^*(1430)\nu$ DECAY

TESTING THE STRUCTURE OF THE SCALAR MESON $K_0^(1430)$ IN $\tau\to K_0^(1430)\nu$ DECAY