Fermi National Accelerator Laboratory, Batavia, Illinois 60510-5011, USA.
Institute of Physics, University of Graz, A-8010 Graz, Austria.
Phys Rev Lett. 2013 Nov 27;111(22):222001. doi: 10.1103/PhysRevLett.111.222001. Epub 2013 Nov 26.
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¯c interpolating fields. The simulation is done on N(f)=2+1 gauge configurations with m(π) is approximately equal to 156 MeV, and the resulting M(D*(s0))-1/4(M(D(s))+3M(D*(s)))=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 to DK scattering states. The levels near threshold lead to the negative DK scattering length a(0)=-1.33(20) fm that indicates the presence of a state below threshold.
在使用 DK 以及 s¯c 内插场的情况下，在 N(f)=2+1 格点组态上进行的 J(P)=0(+) 道的格点模拟中，在 DK 阈下 37(17) MeV 处发现了标量介子 D*(s0)(2317)。该模拟使用的π介子质量约为 156 MeV，得到的 M(D*(s0))-1/4(M(D(s))+3M(D*(s)))=266(16) MeV 接近实验值 241.5(0.8) MeV。与标量介子相关的能级伴随着由于 DK 散射态产生的额外离散能级。阈附近的能级导致负的 DK 散射长度 a(0)=-1.33(20) fm，表明阈下存在一个态。
