CCAST, World Lab, Beijing 100080, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
The decay constant of K-0(*) (1430) is the key quantity to determine the production rate of K-0(*)(1430) in r decays. By assuming K-0(*)(1430) is the lowest scalar bound state of s (q) over bar, the decay constant can be calculated reliably in QCD sum rule. Then the decay branching ratio of tau -> K-0(*)(1430)nu is predicted to be about (7.9 +/- 3.1) x 10(-5). If this branching ratio can be measured by experiment, it should be helpful to make clear the structure of K-0(*)(1430).