The Monte Carlo Generator for J/ψ Decays with Angular Distribution

We present a Monte Carlo scheme to generate events of J/ψ decays with angular distributions based on the acceptance-rejection sampling method. We test this scheme with J/ψ→pbar p and J/ψ→Λ(Λ-bar)→pbar pπ⁺π^- , and the results show that the input angular distributions are well reproduced, and efficiency of the HOWL generator of this scheme is also discussed.