Lattice QCD investigation of a b-bar b-bar u d tetraquark resonance

b-bar b-bar 和四夸克共振的晶格 QCD 研究

• 批准号: 457742095
• 负责人: Professor Dr. Marc Wagner
• 金额: --
• 依托单位: Institut für Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/457742095?language=en
• 关键词: Lattice; QCD; investigation; bar; tetraquark

Our main objective is to study the existence and to determine mass and width of a b-bar b-bar u d tetraquark resonance with quantum numbers I(J^P) = 0(1^−) using lattice QCD. In previous work based on lattice QCD potentials and the Born-Oppenheimer approximation we found indication for the existence of such a resonance. There, however, several approximations have been used, in particular the b-bar quarks have been considered as infinitely heavy and the light and heavy degrees of freedom have been treated separately. Since b-bar quarks of finite mass are expected to weaken binding of the four-quark system, it is important and interesting to perform a full lattice QCD computation, where such approximations are not employed. Such a computation will provide further insights concerning heavy-heavy-light-light tetraquarks, a topic which received considerable interest in recent years, in particular due to the experimental discovery of the electrically charged Z_c and Z_b tetraquark states.

我们的主要目标是使用晶格 QCD 来研究量子数 I(J^P) = 0(1^−) 的 b-bar b-bar u d 四夸克共振的存在性并确定其质量和宽度。晶格 QCD 势和玻恩-奥本海默近似我们发现了这种共振存在的迹象，然而，已经使用了几种近似，特别是考虑了 b-bar 夸克。由于无限重，并且轻自由度和重自由度已被分开处理，由于有限质量的 b-bar 夸克预计会削弱四夸克系统的结合，因此执行完整的晶格 QCD 计算非常重要且有趣。这种近似并未被采用，这样的计算将提供有关重-重-轻-轻四夸克的进一步见解，这个话题近年来引起了相当大的兴趣，特别是由于带电 Z_c 和 的实验发现。 Z_b 四夸克态。