Low-energy D*+D10 scattering and the resonancelike structure Z+(4430)

Low-energy scattering of D*+ and D10 meson are studied using quenched lattice QCD with improved lattice actions on anisotropic lattices. The calculation is performed within Luescher's finite-size formalism, which establishes the relation between the scattering phase in the infinite volume and the exact energy level in the finite volume. The threshold scattering parameters, namely, the scattering length a0 and the effective range r0, for the s-wave scattering in JP=0- channel are extracted. After the chiral and continuum extrapolations, we obtain: a0=2.52(47) fm and r0=0.7(1) fm where the errors are purely statistical. Based on these results, we discuss the possibility of a shallow bound state for the two charmed mesons within the nonrelativistic potential scattering model. It is argued that, albeit the interaction between the two charmed mesons being attractive, it is unlikely that they can form a shallow bound state in this channel. This calculation provides some useful information on the nature of the newly discovered resonancelike structure Z+(4430) by the Belle Collaboration.