Study of light mesons in two-photon interaction

为了理解强相互作用的本质，人们需要解决为什么发现的共振不能都像标准夸克模型那样被描述为介子的难题。事实上，强相互作用理论预测了不同类型的束缚态，比如杂化态、四夸克态和胶球态。它们还没有被唯一地识别出来，需要对不同的产生机制进行研究，以区分具有相同量子数的粒子。本课题研究了双光子相互作用中产生的光介子。数据来源于高统计量BESIII实验。在耦合通道部分波分析中，对量子数为pi， eta， a和f的状态进行了分析。该项目关注的是它们衰变为介子、奇粒子和粒子。这些方法最有可能获得新的结果。与其他项目的比较将揭示束缚态和强相互作用的性质。

To understand the nature of strong interaction one needs to solve the puzzle why the discovered resonances cannot all be described as mesons like in the standard quark model. In fact the theory of strong interaction predicts different types of bound states like hybrids, tetraquarks and glueballs. These are not yet uniquely identified and a study of different productions mechanisms is required to distinguish particles with the same quantum numbers. In this project the light mesons produced in two-photon interaction are studied. The data are obtained from the high-statistics BESIII experiment. In particular states with quantum numbers of the pi, eta, a and f are analyzed in a coupled channel partial wave analysis. The project focuses on their decays into pions, strange and eta particles. These have the highest potential to obtain new results. Comparisons with the other projects will shed light on the nature of the bound states and the strong interaction.