论文标题
搜索$ \ bar {b} \ bar {b} u s $和$ \ bar {b} \ bar {c} u d $ tetraquark使用lattice qcd
Search for $\bar{b} \bar{b} u s$ and $\bar{b} \bar{c} u d$ tetraquark bound states using lattice QCD
论文作者
论文摘要
我们使用晶格QCD来研究强相互作用稳定的抗iHevy-antiheavy-light-light-light tetraquarks的存在。我们研究具有量子数字的$ \ bar b \ bar b u s $系统$ j^p = 1^+$以及$ \ bar b \ bar b \ bar b \ bar c u d $ systems具有量子数字$ i（j^p）= 0（j^p）= 0（0^+）$和$ i（j^p）= 0（1^+）$。我们对五个轨距链接合奏进行计算，并使用$ 2 + 1 $的域壁式费米子进行计算，其中包括一个在物理锥体质量上。底部的夸克是使用晶格非层次QCD实现的，使用各向异性三叶草动作的魅力夸克。除了局部的diquark-antidiquark和局部梅森 - 梅森插值操作员之外，我们还包括下水道的非本地介子 - 梅森操作员，这有助于可靠地确定低覆盖能级的水平。我们发现有明确的证据证明存在强度稳定的$ \ bar b \ bar b b u s $ tetraquark，带有绑定能量$（-86 \ pm 22 \ pm 10）\，\ \ text {mev} $和mass $（10609 \ pm 22 \ pm 22 \ pm pm 10）对于$ \ bar b \ bar c u d $系统，我们找不到有限状态的任何迹象，但也不能排除其存在。
We use lattice QCD to investigate the existence of strong-interaction-stable antiheavy-antiheavy-light-light tetraquarks. We study the $\bar b \bar b u s$ system with quantum numbers $J^P = 1^+$ as well as the $\bar b \bar c u d$ systems with quantum numbers $I(J^P) = 0(0^+)$ and $I(J^P) = 0(1^+)$. We carry out computations on five gauge-link ensembles with $2 + 1$ flavors of domain-wall fermions, including one at the physical pion mass. The bottom quarks are implemented using lattice nonrelativistic QCD, and the charm quarks using an anisotropic clover action. In addition to local diquark-antidiquark and local meson-meson interpolating operators, we include nonlocal meson-meson operators at the sink, which facilitates the reliable determination of the low-lying energy levels. We find clear evidence for the existence of a strong-interaction-stable $\bar b \bar b u s$ tetraquark with binding energy $(-86 \pm 22 \pm 10) \, \text{MeV}$ and mass $(10609 \pm 22 \pm 10) \, \text{MeV}$. For the $\bar b \bar c u d$ systems we do not find any indication for the existence of bound states, but cannot rule out their existence either.
