Du, DS (reprint author), CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.
We calculate the mass and decay constant of I = 1/2 scalar mesons composed of quark-antiquark pairs based on QCD sum rule. The quark-antiquark pairs can be sq or qs (q = u, d) in quark model, the quantum numbers of spin and orbital angular momentum are S = 1, L = 1. We obtain the mass of the ground sate in this channel is 1.410 +/- 0.049 GeV. This result favors that K-0(*)(1430) is the lowest scalar state of sq or qs. We also predict the first excited scalar resonance of sq is larger than 2.0 GeV. (c) 2005 Elsevier B.V. All rights reserved.