Study of (Λ)over-bar decay parameter in J/ψ → Λ(Λ)over-bar decay

The helicity amplitudes for J/psi -> Lambda(Lambda) over bar and the relevant background decays are presented for measuring the Lambda decay parameter alpha(+)((Lambda) over bar Lambda -> (p) over bar pi(+)) in J/psi -> Lambda(Lambda) over bar. The Monte Carlo (MC) simulations based on the helicity amplitudes information are carried out. The likelihood fit method to determine the (Lambda) over bar decay parameter is presented. Based on the MC generated sample, the sensitivity of the measurement for alpha(+) has been estimated, which shows that the J/psi Lambda(Lambda) over bar channel can be used to measure the (Lambda) over bar decay parameter alpha(+) ((Lambda) over bar -> (p) over bar pi(+)) well.