A scheme to fix multiple solutions in amplitude analyses

Autor:	Gao, Yuanning, Rong, Tianze, Yang, Zhenwei, Zhang, Chenjia, Zhang, Yanxi
Rok vydání:	2023
Předmět:	High Energy Physics - Phenomenology High Energy Physics - Experiment
Druh dokumentu:	Working Paper
Popis:	Decays of unstable heavy particles usually involve the coherent sum of several amplitudes, like in a multiple slit experiment. Dedicated amplitude analysis techniques have been widely used to resolve these amplitudes for better understanding of the underlying dynamics. For special cases, where two spin-1/2 particles and two (pseudo-)scalar particles are present in the process, multiple equivalent solutions are found due to intrinsic symmetries in the summed probability density function. In this paper, the problem of multiple solutions is discussed and a scheme to overcome this problem is proposed by fixing some free parameters. Toys are generated to validate the strategy. A new approach to align helicities of initial- and final-state particles in different decay chains is also introduced. Comment: 17 pages, 2 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2302.13862 Zobrazit plný text záznamu View this record from Arxiv