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Recently, there is a need for a general-purpose event generator of decays ofan elementary particle or a hadron to a state of higher multiplicity ($N > 2$)that is simple to use and universal. We present the structure of such a libraryto produce generators that generate kinematics of decay processes and can beused to integrate any matrix element squared over phase space of this decay.Some test examples are presented, and results are compared with results knownfrom the literature. As one of examples we consider the Standard Model Higgsboson decay into four leptons. The generators discussed here are compatiblewith the ROOT interface.

Decay: A Monte Carlo library for the decay of a particle with ROOT compatibility