Amplitude- and truncated partial-wave analyses combined: A single-channel method for extracting photoproduction multipoles directly from measured data

A. Švarc, Y. Wunderlich, L. Tiator
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Abstract

Amplitude- and truncated partial-wave analyses are combined into a single procedure and a novel, almost theory-independent single-channel method for extracting multipoles directly from measured data is developed. In practice, we have created a two-step procedure which is fitted to the same data base: in the first step we perform an energy independent amplitude analysis where continuity is achieved by constraining the amplitude phase, and the result of this first step is then taken as a constraint for the second step where a constrained, energy independent, truncated partial-wave analysis is done. The method is tested on the world collection of data for $\eta$ photoproduction, and the obtained fit-results are very good. The sensitivity to different possible choices of amplitude phase is investigated and it is demonstrated that the present data base is insensitive to notable phase changes, due to an incomplete database. New measurements are recommended to remedy the problem.
振幅和截断部分波分析相结合:直接从测量数据中提取光生产多极子的单通道方法
振幅和截短部分波分析结合成一个单一的程序,并开发了一种新颖的,几乎理论无关的单通道方法,直接从测量数据中提取多极。在实践中,我们创建了一个适合于相同数据库的两步程序:在第一步中,我们执行能量无关的振幅分析,其中通过约束振幅相位实现连续性,然后将第一步的结果作为第二步的约束,其中进行约束,能量无关的截断部分波分析。在世界数据集上对该方法进行了测试,得到了很好的拟合结果。研究了对不同可能的振幅相位选择的敏感性,并证明由于数据库不完整,现有数据库对显著的相位变化不敏感。建议采取新的措施来解决这个问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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