Research on the phase space of three- and four-body final states processes * *Supported by the Fundamental Research Funds for the Central Universities, the National Key R&D Program of China (2020YFA0406400) and the Key Research Program of the Chinese Academy of Sciences (XDPB15)

Abstract

Analytical formulae for the phase space factors and three-momenta of three- and four-body final states are derived for all sets of independent kinematic variables containing invariant mass variables. These formulae will help experimental physicists to perform data analysis. As an example, we show how to use these formulae to distinguish the different mechanisms of the process when searching the signals of states in the energy region of the Electron–Ion collider at China (EicC).