Ds0*(2317) Meson and D-Meson-Kaon Scattering from Lattice QCD

The scalar meson D-s0*(2317) is found 37(17) MeV below the DK threshold in a lattice simulation of the J(P)= 0(+) channel using, for the first time, both DK as well as (s) over bar c interpolating fields. The simulation is done on N-f = 2 + 1 gauge configurations with m(pi) similar or equal to 156 MeV, and the resulting M-Ds0* - 1/4(MDs + 3M(Ds)*) = 266(16) MeV is close to the experimental value 241: 5(0.8) MeV. The energy level related to the scalar meson is accompanied by additional discrete levels due toDK scattering states. The levels near threshold lead to the negativeDK scattering length a(0) = 1. 33(20) fm that indicates the presence of a state belowthreshold.