轻子和强子产生实验中的光介子谱
Light-Meson Spectroscopy at Lepto- and Hadroproduction Experiments
摘要：
由上夸克、下夸克和奇异夸克组成的轻介子的激发谱研究已有几十年的历史。然而，它仍然有许多谜题和惊喜，为强相互作用的本质提供了新的见解。最近从几个实验中获得的高质量数据样本使我们不仅能够以前所未有的精度研究已建立的介子的性质，而且还可以寻找新的状态。这些搜索的目的特别是解决所谓的奇异状态，如四夸克态或激发胶子场的状态的存在问题。由于轻介子通常具有很大的宽度并且是重叠的，因此它们的光谱的映射是具有挑战性的，并且需要关于不同产生和衰变模式的大量数据。使用称为分波分析（PWA）的干扰量子力学振幅的框架来分析数据。大多数激发态介子衰变为多粒子末态，PWA需要对末态强子的动力学进行广泛的建模。我将概述正在进行的实验研究轻介子和讨论可能的解释。我还将谈到新的分析技术和未来发展的前景。
英文摘要：
The excitation spectrum of light mesons, which are composed of up, down, and strange quarks, is studied since decades. However, it still holds a number of puzzles and surprises that provide new insights into the nature of the strong interaction. Recent high-quality data samples from several experiments allow us to not only study the properties of established mesons with unprecedented precision but to also search for new states. These searches aim in particular at resolving the question of the existence of so-called exotic states, such as four-quark states or states with excited gluon fields. Since light mesons have often large widths and are overlapping, the mapping of their spectrum is challenging and requires large quantities of data on different production and decay modes. The data are analyzed using a framework of interfering quantum mechanical amplitudes known as partial-wave analysis (PWA). Most excited meson states decay into multi-particle final states, for which the PWA requires extensive modeling of the dynamics of the final-state hadrons. I will give an overview on ongoing experimental studies of light mesons and discuss possible interpretations. I will also touch on novel analysis techniques and the prospects for future progress.
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