Measurement of nonrandom event-by-event fluctuations of average transverse momentum in √s NN = 200 GeV Au + Au and p + p collisions
Measurement of nonrandom event-by-event fluctuations of average transverse momentum in √s NN = 200 GeV Au + Au and p + p collisions
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DOI：
10.1103/physrevlett.93.092301
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发表时间：
2003-10
影响因子：
8.6
通讯作者：
T. P. C. S. Adler;E. al.
中科院分区：
文献类型：
--
作者：
T. P. C. S. Adler;E. al.
PHENIX合作组在相对论重离子对撞机上测量了（sNN）=200 GeV Au+Au和p+p碰撞中产生的粒子在中快度附近的平均横向动量随事件的涨落。观察到的波动是在统计上独立的粒子发射的所有中心的预期。多余的波动表现出依赖于碰撞的中心性和pT的范围内计算的平均值。的中心性和pT的依赖性可以很好地再现随机粒子生产的模拟与硬散射过程的贡献。
Event-by-event fluctuations of the average transverse momentum of produced particles near midrapidity have been measured by the PHENIX Collaboration in square root of (sNN)=200 GeV Au+Au, and p+p collisions at the Relativistic Heavy Ion Collider. The fluctuations are observed to be in excess of the expectation for statistically independent particle emission for all centralities. The excess fluctuations exhibit a dependence on both the centrality of the collision and on the pT range over which the average is calculated. Both the centrality and pT dependence can be well reproduced by a simulation of random particle production with the addition of contributions from hard-scattering processes.