J/ψ衰变到■K_S^0Λ和K_S^0Σ^+的模拟研究

Monte Carlo Study of J/ψ Decays into ■K_S^0Λ and K_S^0Σ^+

采用北京谱仪BESIII离线模拟软件系统BOSS6.5.1版本对重子衰变道J/ψ→■K0SΛ,J/ψ→KS0Σ+衰变过程进行了蒙特卡罗模拟研究,得到相应的探测效率及本底比率。数值研究结果表明:BESIII上的事例选择效率比BESII提高了两倍多,并且所有的本底事例数对信号影响基本可以忽略,根据J/ψ事例数、探测效率和衰变分支比计算出在BESIII上可以分别得到6 200±1 037和2 794±770好事例。该结果对BESIII上J/ψ总数的取数计划和实验数据分析具有重要的意义。

The decays of J/Ф→n-K0 s ∧ and J/Ф→p-K0s ∑＋ are studied based on BESIII simulation system BOSS6. 5.1. The signal particles are selected with the help of the particle identification software. Both the selection efficiency and background proportion are obtained,and the J/Фb data taking plan is estimated for the baryon excited states study requirement.