运用Bethe-Salpeter方程研究奇特强子态的性质

强子结构及其内部相互作用是粒子物理学的重要研究领域。随着LHC和BEPC-II等实验装置的运行，越来越多的奇特强子态被发现，这些奇特态的性质并不能被传统的夸克模型所解释，可能具有多夸克态、分子态、混杂态等复杂结构。申请者在前期工作中运用Bethe-Salpeter(BS)方程研究了X(3872)、B_{s1}(5778)、Y(4260)等作为分子态的性质以及重子的留数，完成了一系列重要工作。本项目将在原有工作的基础上，建立不同奇特态的BS方程，如P_{c(b)}态作为Σ_{c(b)}D^*(B^*)分子态、Z_cs(3985)和X(2900)作为由两个diquark组成的四夸克态等，通过求解BS方程分析这些奇特态作为分子态或者四夸克态的可能性，计算可能存在衰变道的衰变宽度，同时也可以预言可能存在的奇特态。这些研究可以在实验上得到检验，增进我们对奇特态结构和强相互作用的理解。

Research on the structures and inner interactions of hadrons has been an important area in particle physics. Along with the running of LHC and BEPC-II, more and more exotic hadronic states have been observed, the nature of these exotic states cannot be explained by the traditional quark model, they could be multi-quark states, molecular states, hybrid states, etc. Applicants have systematically studied the properties of X(3872), B_{s1}(5778), Y(4260), etc. as molecular states and the residues of baryons in the BS formalism and achieved a series of important works. In this project, based on our previous works, applicants will establish the BS equations of different of exotic states, such as P_{c(b)} as Σ_{c(b)} D^*(B^*) molecular state, Z_cs(3985)and X(2900) as tetraquark composed of two diquark, etc, analyze the possibility of them being as molecular states or tetraquark states by solving BS equations, and calculate the decay width of their possible decay channels, we can also predict the possible existed exotic states. These studies can be tested in experiments and will enhance our understanding of the structure and strong interactions of exotic states.