粒子横向动量模的关联对粒子群关联的贡献

Contribution of Correlations of Transverse Momentum Magnitude of Particles to Particle-group Correlations

关键词:  集合流  粒子群关联  横向动量模关联  高阶集合流关联

Key words:  collective flow  particle-group correlations  correlations of transverse momentum magnitude  high-order collective-flow correlations

摘要:

提出一种新的唯象集合流事件模拟方法,该模拟方法同时考虑了粒子分布的方位角关联和横向动量模关联。采用粒子群关联函数方法分析了2.1AGeVNe+NaF碰撞的Bevalac流光室4π实验数据中粒子横向动量模关联对集合流及高阶集合流关联的贡献。研究表明:少数携带较大横向动量的粒子(或碎片)可以产生集合流效应,但高阶集合流关联确不受其支配,而是多数关联粒子(或碎片)集体贡献的结果。对于这组碰撞实验,粒子分布的方位角关联相对横向动量模关联在粒子群关联中起着主要作用。

Abstract:

A new simulative method of phenomenological collective flow events is proposed, which involves both the azimuthal correlations of distribution and the correlations of transverse momentum magnitude of particles. Using the method of particlegroup correlation's function,the contributions of the correlations of transverse momentum magnitude of particles on collective flow and high-order collective-flow correlations are analyzed with 4 π data for 2.1 A GeV Ne+NaF collisions at the Bevalac stream chamber.Our studies indicate that the minority of correlated particles (or fragments) with larger 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 dominated by these minority of particles (or fragments),but by the collective contribution of the majority of correlated particles (or fragments).Comparing with the correlations of transverse momentum magnitude,the azimuthal correlations of particles distribution dominate particle-group correlations in this experimental data samples.