Light Quark Dynamics in Charmonium and Bottomonium Systems

该项目旨在研究手征对称性在分子图像中新发现的XYZ态的性质中的作用。为了实现这一目标，我们提出了一个系统的方法，手征有效场理论的基础上，考虑到所有相关的尺度，如介子质量，结合动量和动量出现由于附近的三体通道，涉及π介子和一个迷人的/底介子对的存在。 我们将特别关注粲偶素型态X（3872）和底偶素型态Z_B（10610）和Z_B（10650）的手征动力学。在有效场论框架内系统地包含相关标度，将使我们能够对X（3872）和Z_B共振的分子自旋/同位旋伙伴态作出可靠的预测。在项目的后期阶段，将讨论SU（3）味对称性和重夸克对称性的含义。这些调查将导致新的见解的XYZ状态的性质，并提供有价值的信息，他们的夸克质量的依赖，这是重要的正在进行/即将到来的格子QCD计算。

This project aims to investigate the role of chiral symmetry in the properties of the newly discovered XYZ states within the molecular picture. To reach this goal, we propose a systematic approach based on chiral effective field theory which takes into account all relevant scales such as the pion mass, binding momenta and momenta emerging due to the presence of nearby three-body channels involving pion and a charmed/bottom meson pair. We will, in particular, focus on chiral dynamics of the charmonium-type state X(3872) and the bottomonium-type states Z_b(10610) and Z_b(10650). The systematic inclusion of the relevant scales within the effective field theory framework will allow us to make reliable predictions for the molecular spin/isospin partner states of the X(3872) and Z_b resonances. At a later stage of the project implications of the SU(3) flavour symmetry and heavy-quark symmetries will be addressed. These investigations will lead to new insights into the nature of the XYZ states and provide valuable information on their quark mass dependence which is important for ongoing/upcoming lattice-QCD calculations.