来自格点量子色动力学的四夸克候选态Zc(3900)的命运

Fate of the Tetraquark Candidate Z_{c}(3900) from Lattice QCD.

作者信息

Ikeda Yoichi, Aoki Sinya, Doi Takumi, Gongyo Shinya, Hatsuda Tetsuo, Inoue Takashi, Iritani Takumi, Ishii Noriyoshi, Murano Keiko, Sasaki Kenji

机构信息

Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan.

Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198, Japan.

出版信息

Phys Rev Lett. 2016 Dec 9;117(24):242001. doi: 10.1103/PhysRevLett.117.242001.

DOI:10.1103/PhysRevLett.117.242001

PMID:28009206

Abstract

The possible exotic meson Z_{c}(3900), found in e^{+}e^{-} reactions, is studied by the method of coupled-channel scattering in lattice QCD. The interactions among πJ/ψ, ρη_{c}, and D[over ¯]D^{} channels are derived from (2+1)-flavor QCD simulations at m_{π}=410-700 MeV. The interactions are dominated by the off-diagonal πJ/ψ-D[over ¯]D^{} and ρη_{c}-D[over ¯]D^{*} couplings, which indicates that the Z_{c}(3900) is not a usual resonance but a threshold cusp. Semiphenomenological analyses with the coupled-channel interaction are also presented to confirm this conclusion.

摘要

在 (e^{+}e^{-}) 反应中发现的可能的奇特介子 (Z_{c}(3900))，采用格点量子色动力学中的耦合通道散射方法进行研究。(\pi J/\psi)、(\rho\eta_{c}) 和 (D\overline{D}^{}) 通道之间的相互作用源自于在 (m_{\pi}=410 - 700,\text{MeV}) 下的 ((2 + 1)) 味量子色动力学模拟。这些相互作用主要由非对角的 (\pi J/\psi - D\overline{D}^{}) 和 (\rho\eta_{c} - D\overline{D}^{*}) 耦合主导，这表明 (Z_{c}(3900)) 不是一个常规共振态，而是一个阈值尖点。还给出了用耦合通道相互作用进行的半唯象分析以证实这一结论。