A novel method to test particle ordering and final state alignment in helicity formalism *
A novel method to test particle ordering and final state alignment in helicity formalism *
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DOI：
10.1088/1674-1137/abf139
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
Mengzhen Wang;Yiyu Jiang;Yinrui Liu;W. Qian;X. Lyu;Liming Zhang
中科院分区：
文献类型：
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作者：
Mengzhen Wang;Yiyu Jiang;Yinrui Liu;W. Qian;X. Lyu;Liming Zhang
在这篇文章中，一个适当的参考粒子的衰变角定义的重要性进行了论证，当使用螺旋度形式主义构造多体衰变的分波振幅。这个问题在螺旋度形式主义的标准用例中经常被忽略。提出了一种新的技术来确定正确的粒子排序，也可以作为一种广义的方法来计算用于不同衰变链之间的最终状态对齐的旋转算子。数值验证也支持本文提出的论点和新技术。
In this article, the importance is demonstrated of a proper choice of reference particles for decay angle definitions, when constructing partial-wave amplitude of multi-body decays using helicity formalism. This issue is often ignored in the standard use case of the helicity formalism. A new technique is proposed to determine the correct particle ordering, and can also be used as a generalized method to calculate the rotation operators used for the final-state alignment between different decay chains. Numerical validations are also performed to support the arguments and new technique proposed in this article.