基于关联函数的反重-反重-轻-轻四夸克态的格点量子色动力学研究
Lattice QCD study of antiheavy-antiheavy-light-light tetraquarks based on correlation functions with scattering interpolating operators both at the source and at the sink
摘要：
我们提出了最近开始的格点量子色动力学研究的反重-反重-轻-轻四夸克系统的第一个结果，包括散射插值算子的关联函数在源和在汇。特别是，我们讨论了这样的散射插值算子的重要性，精确计算的低能级。我们研究了量子数为$I(J^P) = 0(1^+)$的$\bar b \bar b u d$四夸克系统，该系统的基态低于最低的介子-介子阈值。我们利用Lüscher方法进行散射分析，将相应的QCD稳定四夸克态的结合能外推到无限大的空间体积。我们的计算使用三叶草$u$，$d$价夸克和NRQCD $b$价夸克与HISQ海夸克，由MILC合作产生的规范链接合奏。
英文摘要：
We present first results of a recently started lattice QCD investigation of antiheavy-antiheavy-light-light tetraquark systems including scattering interpolating operators in correlation functions both at the source and at the sink. In particular, we discuss the importance of such scattering interpolating operators for a precise computation of the low-lying energy levels. We focus on the $\bar b \bar b u d$ four-quark system with quantum numbers $I(J^P) = 0(1^+)$, which has a ground state below the lowest meson-meson threshold. We carry out a scattering analysis using Lüscher's method to extrapolate the binding energy of the corresponding QCD-stable tetraquark to infinite spatial volume. Our calculation uses clover $u$, $d$ valence quarks and NRQCD $b$ valence quarks on gauge-link ensembles with HISQ sea quarks that were generated by the MILC collaboration.
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