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首页> 外文会议>International Workshop on Production, Properties and Interaction of MESONS >Near-threshold pion production in diproton reactions with polarised beams and target at ANKE-COSY
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Near-threshold pion production in diproton reactions with polarised beams and target at ANKE-COSY

机译：Diproton反应的近阈值沟渠生产与偏光梁和瞄准anke-cozy

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An extensive experimental study of near-threshold pion production in diproton reactions is underway at the ANKE-COSY spectrometer (Jülich). The programme is aimed at isolating the four-nucleon-pion contact interaction term appearing in the χPT expansions of these processes. This will establish links between pion production and other low energy phenomena within the χPT approach. The first step in the programme was to measure the differential cross-section and the proton analysing power in the pp → {pp}_s π~0 and pn → {pp}_s.π~-reactions over the full angular range. Here {pp}_s denotes a diproton, i.e., a two-proton system in a ~1S_0 state. These data allow a partial wave analysis to be carried out provided that simplifying assumptions are made when applying the Watson theorem. To make the analysis more robust, and independent of the uncertainties in the relative normalization, the spin-correlation coefficients A_(x.x) and A_(y,y) in the np → {pp}_sπ~- reaction were measured in a follow-up experiment. The first results of the data analysis are presented and future developments of the programme are outlined.
机译：在Anke-Cozy光谱仪（Jülich）中，在Diproton反应中的近阈值接近近阈值介质产生了广泛的实验研究。该程序旨在隔离出现在这些过程的签名中出现的四核π接触相互作用术语。这将在◄PTED的方法中建立凹坑生产和其他低能量现象之间的联系。该程序的第一步是测量PP→{PP}π〜0和PN→{PP}_S.π〜-orecations的差分横截面和质子分析功率在完全角度范围内。这里{pp} _s表示diproton，即，在〜1s_0状态下是一个双质子系统。这些数据允许进行部分波分析，只要在应用Watson定理时简化假设。为了使分析更稳健，并且独立于相对归一化中的不确定性，在后续测量NP→{PP}_Sπ-反应中的旋转相关系数A_（XX）和A_（Y，Y） - 实验。提出了数据分析的第一个结果，概述了该计划的未来发展。

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