1208.4535 (Liuming Liu et al.)

Interactions of Charmed Mesons with Light Pseudoscalar Mesons from
Lattice QCD and Implications on the Nature of the D_{s0}^*(2317)    [PDF]

Liuming Liu, Kostas Orginos, Feng-Kun Guo, Christoph Hanhart, Ulf-G. Meißner

We study the scattering of light pseudoscalar mesons (\pi, K) off charmed mesons (D, D_s) in full lattice QCD. The S-wave scattering lengths are calculated using L\"uscher's finite volume technique. We use a relativistic formulation for the charm quark. For the light quark, we use domain-wall fermions in the valence sector and improved Kogut-Susskind sea quarks. We calculate the scattering lengths of isospin-3/2 D\pi, D_s\pi, D_sK, isospin-0 D\bar{K} and isospin-1 D\bar{K} channels on the lattice. For the chiral extrapolation, we use a chiral unitary approach to next-to-leading order, which at the same time allows us to give predictions for other channels. It turns out that the interpretation of the D_{s0}^*(2317) as a DK molecule is consistent with the results. At the same time, we also update a prediction for the isospin breaking hadronic decay width \Gamma(D_{s0}^*(2317)\to D_s\pi) to (89\pm 27) keV.

View original: http://arxiv.org/abs/1208.4535