The Two-scalar-meson Decay Of X_CJ With Twist-3Corrections

Although the quark model and QCD have achieved great successes, the inner structure of scalar mesons is not well established theoretically. In this work,we will assume that scalar mesons are both dominated by the qq component.And we treat k,ao(980),f0(980) as the lowest lying states, and K0*(1430),a0(1500),f0(1500) as the corresponding first excited states, respectively.In this scenario.we calculate the exclusive decays Xc0.2�'SS within perturbative QCD approach based on kT factorization. For the non-perturbation parameters of hadronic matrix elements related to the initial state of P-wave charmonium, we used the zero point wavefunction Rp’(0) in the non relativistic approximation. For the final state of pseudoscalar meson, we expand the hadronic matrix elements with different twist light-cone wavefunction to the highest order for the two-partice twist-3wavefunction.According to the above scheme,after including the effects from the transverse momentum of light meson valence-quark state and Sudakov factors. We analyze the decay widths of the Xc0.2into scalar meson pairs in the reasonable range of charm quark mass and non-perturbed parameter β. Our results show the Γ(Xc0�'f0(980)f0(980)、f0(1500)f0(1500)) are consisten with the corresponding experimental data.With more experimental data in the future,these studies will help us understand the intrinsic characters of these scalar mesons.On the hand,we find that the contributions from twist-3parts are actually not power suppressed comparing with the leading-twist contribution in these decays.