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对每核子 2 0 0GeV的S +Pb中心碰撞中产生的Λ粒子的横向极化度消失的现象作了细致研究 .用相对论核 -核碰撞的Monte Carlo事例产生器———LUCIAE产生了相应能量下的S+Pb中心碰撞事例 ,定量地分析了消除Λ粒子横向极化度的各种因素 ,研究了反应中的二次散射、二次产生以及Σ ,Ξ等超子衰变产生的Λ粒子在总的实验测量到的Λ总数中的比例 ,确定了由这些Λ粒子造成的退极化度对总的Λ极化度的影响 .模拟和计算结果表明 ,以上 3个效应强烈地影响了Λ的横向极化度 ,但不可能使终态假定为强子气时Λ粒子的横向极化度完全消失 .为了解释Λ极化度近于零的实验结果 ,可能需要在相对论重核碰撞中引进Λ粒子产生的新的机制 ,包括存在形成夸克 -胶子等离子体 (QGP)的弱效应
The phenomenon that the lateral polarizability of the Λ particles disappeared during the collisions of S + Pb centers at 200 GeV per nucleon has been studied in detail.LUCIAE, a Monte Carlo case generator of relativistic nuclear-nuclear collisions, produces the corresponding energy Under the S + Pb center collision case, quantitative analysis of the Λ particle horizontal polarization degree of the various factors studied in the reaction secondary scattering, secondary generation and Σ, Ξ and other super-decay produced by the Λ particles in The total experimentally measured ratio of the total number of Λ determines the effect of depolarization due to these Λ particles on the total Λ polarization.The simulation and calculation results show that the above three effects strongly affect the Λ Lateral polarizability, it is impossible to make the lateral polarizability of the Λ particles completely disappear when the final state is assumed to be a hadronic gas.In order to explain the experimental results of the near-zero polarizability of Λ, it may be necessary to introduce Λ New mechanisms of particle generation, including the presence of quark-gluon plasma (QGP) weak effects