COMPASS pp反应中心产生双赝标末态的分波分析
A Partial-Wave Analysis of Centrally Produced Two-Pseudoscalar Final States in pp Reactions at COMPASS
摘要：
COMPASS是CERN SPS的一个固定目标实验，在2008年和2009年的数据采集期间专注于轻夸克强子光谱学。利用190 GeV/c强子束轰击液氢靶，获得了一组世界领先的数据，用于研究胶球候选者的中心产生。在这份报告中，我们激发双坡密子交换作为一个相关的生产过程的介子没有价夸克的内容。我们选择一个集中产生的样品从COMPASS数据集记录的质子束，并引入分解成分波。特别注意的是固有的数学模糊性，在振幅分析的两个赝标量的最终状态。此外，我们展示了一个简单的参数化的中心产生的K+K-系统，它可以描述的质量依赖的拟合结果与明智的Breit-Wigner参数。
英文摘要：
COMPASS is a fixed-target experiment at CERN SPS which focused on light-quark hadron spectroscopy during the data taking in 2008 and 2009. A world-leading data set was collected with a 190GeV/c hadron beam impinging on a liquid hydrogen target in order to study the central production of glueball candidates. In this report, we motivate double-Pomeron exchange as a relevant production process for mesons without valence quark content. We select a centrally produced sample from the COMPASS data set recorded with a proton beam and introduce a decomposition into partial waves. Particular attention is paid to inherent mathematical ambiguities in the amplitude analysis of two-pseudoscalar final states. Furthermore, we show a simple parametrisation for the centrally produced K+K- system which can describe the mass dependence of the fit results with sensible Breit-Wigner parameters.
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