Abstract
The formalisms of helicity coupling amplitudes forJ/ψ→π+π−π0 are presented. Adetailed discussion is also given on the barrier factor,Breit–Wigner, and density matrix. A Monte Carlo simulation ofJ/ψ→ρ(770)π→π+π−π0 is carried out.The results show that the ρ(770) resonance is wellreproduced compared with experimental data.
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