ThreeBodyDecays.jl is a Julia package for building three-body decay models using a cascade reaction. It is designed for researchers and scientists in the field of particle physics.
The main focus of the project is the three-particle amplitudes.
Decays with three particles is the main application of the approach, however, it is also found useful in multibody decays where
transitions can be factorized to a product of sequential decays with
The implementation is based on a research paper, "Dalitz-plot decomposition for three-body decays" by JPAC Collaboration (M Mikhasenko at al.) (arxiv). The code mostly inherits notations of the paper:
- Particles are numbered 1,2,3, and 0 for the decay products and the mother particle, respectively.
m0is a mass of the decay particle, andm1,m2,m3are masses the final-state particles.σis a two-particle invariant mass squared,σk = (pi+pj)²,θijis a scattering angle, an angle betweenvec piand- vec pk.ζ⁰ₖ₍ⱼ₎is the Wigner angle of the 0-particle, an angle ofvec pⱼ+pⱼwith respect the the chainj.ζᵏᵢ₍ⱼ₎is the Wigner angle for the particlek(the angle in the rest frame of particlek) that is mismatched for the chainiwith respect to the chainj.
See example for a demomostration case.
using Pkg
Pkg.add("ThreeBodyDecays")We welcome contributions! Please submit an issue to start a discussion.
This project is licensed under the MIT License.
For more information, please contact mikhail.mikhasenko@cern.ch.