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The formalisms of helicity coupling amplitudes for J/ψ→π~+π~-π~0 are presented.A detailed discussionis also given on the barrier factor,Breit-Wigner,and density matrix.A Monte Carlo simulation of J/ψ→p(770)π→π~+π~-π~0 is carried out.The results show that the p(770) resonance is well reproduced compared with experimental data.
The formalisms of helicity coupling amplitudes for J / ψ → π ~ + π ~ -π ~ 0 are presented. Detailed discussion is also given on the barrier factor, Breit-Wigner, and density matrix. A Monte Carlo simulation of J / ψ → p (770) π → π ~ + π ~ -π ~ 0 is carried out. The results show that the p (770) resonance is well reproduced compared with experimental data.