关于有争议的$π_1(1600)$共振和一个新的等矢量共振的观测
On the disputed $π_1(1600)$ resonance and observation of a new iso-vector resonance
摘要：
欧洲核子研究中心的COMPASS实验为寻找奇异介子提供了新的结果。自旋奇异共振，$π_1(1600)$，在过去的几个实验报告。然而，这些意见至今仍在社会上引起很大争议。特别是$ρπ$衰变通道允许同时观察不同衰变模式中已建立的和不太为人所知的共振。从衍射产生的$(3π)^{-}$最终状态的振幅分析的结果显示一致的自旋奇异信号，这似乎与以前的观测结果的$π_1(1600)$。高统计2008年的数据样本允许和要求的扩展振幅分析方法，进一步解开共振和非共振粒子的生产。本文讨论了COMPASS资料的分析和一种新的等矢量介子$a_1(1420)$的观测现状。
英文摘要：
The COMPASS experiment at CERN delivers new results on the search for exotic mesons. A spin-exotic resonance, the $π_1(1600)$, was reported by several experiments in the past. Those observations are, however, still to date highly disputed in the community. Especially the $ρπ$ decay channel allows for simultaneous observation of well established and less known resonances in different decay modes. The results from amplitude analysis of diffractively produced $(3π)^{-}$ final states show consistently a spin-exotic signal, that appears in agreement with previous observations of the $π_1(1600)$. The high-statistics 2008 data sample allows and demands for an extended amplitude analysis method that further disentangles resonant and non-resonant particle production. The present status of analysis of COMPASS data and the observation of a new iso-vector meson $a_1(1420)$ is discussed.
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