COMPASS光介子的自由等压线分析

F. Krinner
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引用次数: 0

摘要

像COMPASS这样的现代强子光谱实验收集了前所未有的数据样本,因此新的分析技术成为可能和必要。其中一种技术是自由等压线部分波分析(PWA)。在这种方法中,通常使用Breit-Wigner形状建模的中间状态振幅的固定参数化被从数据中确定的步长函数集所取代。这种方法不仅减少了部分波分析的模型依赖性,而且使我们能够研究中间状态的振幅及其对母系统的依赖性。我们还将介绍在COMPASS实验收集的三个带电介子衍射产生的大数据集上进行的自由等压线PWA的结果,该数据集由$46\times10^6$专属事件组成。我们将集中讨论具有自旋奇异量子数$J^{PC}=1^{-+}$的波的结果,特别是它衰变成$\rho(770)\pi$的结果。在这里,自由等压线PWA方法提供了对三粒子和二粒子动力学相互作用的洞察,并证实了自旋奇异$\pi_1(1600)$共振以一种与模型无关的方式衰减到$\rho(770)\pi$。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Freed-isobar analysis of light mesons at COMPASS
Modern hadron-spectroscopy experiments such as COMPASS collect data samples of unprecedented size, so that novel analysis techniques become possible and necessary. One such technique is the freed-isobar partial-wave analysis (PWA). In this approach, fixed parametrizations for the amplitudes of intermediate states commonly modeled using Breit-Wigner shapes are replaced by sets of step-like functions that are determined from the data. This approach not only reduces the model dependence of partial-wave analyses, but also allows us to study the amplitudes of the intermediate states and their dependence on the parent system. We will also present results of a freed-isobar PWA performed on the large data set on diffractive production of three charged pions collected by the COMPASS experiment, which consists of $46\times10^6$ exclusive events. We will focus on results for the wave with spin-exotic quantum numbers $J^{PC}=1^{-+}$, in particular on its decay into $\rho(770)\pi$. Here, the freed-isobar PWA method provides insight into the interplay of three- and two-particle dynamics and confirms the decay of the spin-exotic $\pi_1(1600)$ resonance to $\rho(770)\pi$ in a model-independent way.
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