D s 0 * ( 2317 ) Meson and D -Meson-Kaon Scattering from Lattice QCD
2013; American Physical Society; Volume: 111; Issue: 22 Linguagem: Inglês
10.1103/physrevlett.111.222001
ISSN1092-0145
AutoresDaniel Mohler, C. B. Lang, Luka Leskovec, Sasa Prelovsek, R. M. Woloshyn,
Tópico(s)High-Energy Particle Collisions Research
ResumoThe scalar meson $D_{s0}^*(2317)$ is found 37(17)MeV below DK threshold in a lattice simulation of the $J^P=0^+$ channel using, for the first time, both DK as well as $\bar sc$ interpolating fields. The simulation is done on $N_f=2+1$ gauge configurations with $m_\pi\simeq 156 $MeV, and the resulting $M_{D_{s0}^*}-\tfrac{1}{4}(M_{D_s}+3M_{D_s^*})=266(16)$ 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.
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