通过振幅分析从极化重子衰变中提取最大信息：$Λ^+_c \to pK^-π^+$事例
Extracting maximum information from polarised baryon decays via amplitude analysis: the $Λ^+_c \to pK^-π^+$ case
摘要：
我们考虑了在螺旋度形式体系中，通过振幅分析从极化重子衰变分布中可测量的最大信息是什么。我们特别关注的分析研究的$Λ^+_c \to pK^-π^+$衰减分布，表明其衰减振幅的全部信息可以从其分布中提取，允许同时测量的螺旋度振幅和偏振矢量。这打开了使用$Λ^+_c \to pK^-π^+$衰变的应用范围从新物理搜索到低能QCD研究的可能性，特别是它作为绝对偏振计的$Λ^+_c$重子。这一结果对于具有相同自旋结构的重子衰变也是有效的，并用Monte Carlo伪数据对结果进行了数值验证。
英文摘要：
We consider which is the maximum information measurable from the decay distributions of polarised baryon decays via amplitude analysis in the helicity formalism. We focus in particular on the analytical study of the $Λ^+_c \to pK^-π^+$ decay distributions, demonstrating that the full information on its decay amplitudes can be extracted from its distributions, allowing a simultaneous measurement of both helicity amplitudes and the polarisation vector. This opens the possibility to use the $Λ^+_c \to pK^-π^+$ decay for applications ranging from New Physics searches to low-energy QCD studies, in particular its use as absolute polarimeter for the $Λ^+_c$ baryon. This result is valid as well for baryon decays having the same spin structure and it is cross-checked numerically by means of a toy amplitude fit with Monte Carlo pseudo-data.
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