用阶乘矩技术提高相对论重离子碰撞实验数据样本中QGP事件比例的方法

An Algorithm for Increasing the Ratio of QGP Candidate Events in Relativistie Heavy Ion Collision Data Sample Using Factorial Moment Technique

在相对论重离子碰撞中形成QGP时，与之相伴随的有一些非QGP背景事件．把末态（方位角、快度）二维相空间中阶乘矩剧烈上翘的消失与一些普遍认为的QGP信号（如K／π比的上升）联系起来讨论，提出了一种从实验数据中挑选候选的QGP事件的方法．用Mont－Carlo模拟表明，这种方法有效地提高了挑选出来的子样本中QGP事件的信噪比．

The formation of quark-gluon plasma (QGP) in relativistic heavy ion collision, is expected to be accompanied by a background of ordinary collision events without phase transition. In this short note an algorithm is proposed to select the QGP candidate events from the whole event sample. This algorithm is based on a simple geometrical consideration together with some ordinary QGP signal, e.g. the increasing of K/π ratio. This algorithm increases the "signal to noise ratio" of QGP events in the selected sub-sample in shown explicitly by using Monte-Carlo simulation.