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中文摘要：
The helicity amplitudes for J/ψ→Λ■ and the relevant background decays are presented for measuring the ■ decay parameter α+(■→π+) in J/ψ→Λ■. The Monte Carlo (MC) simulations based on the helicity amplitudes information are carried out. The likelihood fit method to determine the ■ decay parameter is presented. Based on the MC generated sample, the sensitivity of the measurement for α+ has been estimated, which shows that the J/ψ→Λ■ channel can be used to measure the ■ decay parameter α+(■→π+) well.
英文摘要：
The helicity amplitudes for Jψ→ ∧∧ and the relevant background decays are presented for measuring the ∧ decay parameter α ＋（∧ → pπ^＋） in J/ψ→ ∧∧. The Monte Carlo （MC） simulations based on the helicity amplitudes information are carried out. The likelihood fit method to determine the .∧ decay parameter is presented. Based on the MC generated sample, the sensitivity of the measurement for α＋ has been estimated, which shows that the J/ψ→ ∧∧ channel can be used to measure the .∧ decay parameter α＋（∧ → pπ^＋） well.
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