K₀*(1430) twist-2 distribution amplitude and B_s, D_s K₀*(1430) transition form factors

Based on the scenario that the K-0*(1430) is viewed as the ground state of s (q) over bar or q (s) over bar, we study the K-0*(1430) leading-twist distribution amplitude (DA) phi(2;K0*)(x, mu) with the QCD sum rules in the framework of background field theory. A more reasonable sum rule formula for xi-moments (2;K0*) is suggested, which eliminates the influence brought by the fact that the sum rule of (3); K-0* cannot be normalized in whole Borel region. More accurate values of the first ten xi-moments, (2;K0*) (n = 1, 2, ..., 10), are evaluated. A new light-cone harmonic oscillator (LCHO) model for K-0*(1430) leading-twist DA is established for the first times. By fitting the resulted values of (2;K0*) (n = 1, 2, ..., 10) via the least squares method, the behavior of K-0*(1430) leading-twist DA described with LCHO model is determined. Further, by adopting the light-cone QCD sum rules, we calculate the B-s, D-s -> K-0*(1430) transition form factors and branching fractions of the semileptonic decays B-s, D-s -> K-0*(1430)l(vl). The corresponding numerical results can be used to extract the Cabibbo-Kobayashi-Maskawa matrix elements by combining the relative experimental data in the future.