A novel method to test particle ordering and final state alignment in helicity formalism

• 作者: Mengzhen Wang Yi Jiang Yinrui Liu Wenbin Qian Xiao-Rui Lyu Liming Zhang
• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: PARTICLES AND FIELDS
• 页码范围: 29-36
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1137/abf139

摘要

In this study,the non-trival effect of the selection of reference particles for decay angle definitions is demonstrated when constructing the partial-wave amplitude of multi-body decays using helicity formalism.This is-sue is often ignored in the standard use case of helicity formalism.A new technique is proposed to test the selection of the particle ordering,and it can also be used as a generalized method to calculate the rotation operators that are used for the final-state alignment between different decay chains.Moreover,numerical validations are performed to support the arguments and to verify the effectiveness of the proposed technique.