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The decay modes and fractions in particle physics are some quantitative andvery complex questions. Various decays of particles and some known decayformulas are discussed. Many important decays of particles and some knowndecays of resonances can be generally described by the square of some types ofthe associated Legendre functions. It is combined with the selection rule, thenthe agreements are very good. The decay formulas of the similar decay modes arethe same. For the same types of particles, the coupling constants are kept tobe invariant, and only six constants are independent. The simplest dynamicalbasis is probably that the decay formulas are the square of the solution offree field equation of the decay particles in the momentum coordinate system.Further, we discuss some general decays and their rules. Finally, we apply thedecay formulas to some massive hadrons.

Various Decays of Particles, Universal Decay Formulas and Their Possible Dynamic Basis and Applications