粒子横向动量模对高阶集合流关联的贡献

Contribution of Particle Transverse Momentum Magnitude for High-order Collective- flow Correlations

基于文献［１—２］，本文提出了一种检测高阶集合流关联效应的新方法，该方法能够检测少数携带较大横向动量模的关联粒子（或碎片）对高阶集合流关联效应的贡献程度。采用新方法，对Ｂｅ－ｖａｌａｃ流光室２．１ＡＧｅＶＮｅ＋ＮａＦ实验事件的高阶集合流关联进行了研究。研究表明：少数携带较大的横向动量模的关联粒子（或碎片）可以产生集合流效应，但高阶集合流关联效应确不受其支配，而是多数关联粒子（或碎片）集体贡献的结果。

On the basis of the papers[1 -2], a new measurement method of high-order collective flow correlations are proposed in this paper,which can measure the contribution of the minority correlated particles (or fragments) with large transverse momentum magnitudes for high-order collective flow correlations. Using new method, the high-order collective flow correlations are studied with 4π data for 2. 1 A GeV Ne+NaF collisions at the Bevalac streamer chamber. Our studies indicate that the minority correlated particles (or fragments)with large transverse momentum magnitudes can produce the effect arising from the collective flow and the effect arising from high-order collective flow correlations can not be doninated by these minority particles(or fragments),but by the collective contribution of the majority of correlated particles (or fragments)