- 
								[1]
								J. D. Richman, An Experimenter’s Guide to the Helicity Formalism 
- 
								[2]
								R. Aaij et al. (LHCb), Phys. Rev. Lett. 115, 072001 (2015), arXiv:1507.03414 
- 
								[3]
								M. Mikhasenko et al. (JPAC), Phys. Rev. D 101, 034033 (2020), arXiv:1910.04566 
- 
								[4]
								P. A. Zyla et al. (Particle Data Group), PTEP 2020, 083C01 (2020 
- 
								[5]
								D. Marangotto, Helicity amplitudes for generic multi-body particle decays featuring multiple decay chains, arXiv: 1911.10025 
- 
								[6]
								M. Jacob and G. C. Wick, Annals Phys. 7, 404 (1959 
- 
								[7]
								M. Srednicki, Quantum field theory. Part 2. Spin one half, arXiv: hep-th/0409036