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University of Birmingham, Birmingham, United Kingdom.
Phys Rev Lett. 2004 Feb 13;92(6):062301. doi: 10.1103/PhysRevLett.92.062301. Epub 2004 Feb 12.
We report the first observations of the first harmonic (directed flow, v(1)) and the fourth harmonic (v(4)), in the azimuthal distribution of particles with respect to the reaction plane in Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). Both measurements were done taking advantage of the large elliptic flow (v(2)) generated at RHIC. From the correlation of v(2) with v(1) it is determined that v(2) is positive, or in-plane. The integrated v(4) is about a factor of 10 smaller than v(2). For the sixth (v(6)) and eighth (v(8)) harmonics upper limits on the magnitudes are reported.
我们报告了在布鲁克海文国家实验室相对论重离子对撞机（RHIC）上金离子与金离子碰撞中，粒子相对于反应平面的方位角分布里，对基波（定向流，v(1)）和第四谐波（v(4)）的首次观测结果。这两项测量都是利用RHIC产生的大椭圆流（v(2)）进行的。通过v(2)与v(1)的相关性确定v(2)为正，即面内方向。v(4)的积分值比v(2)小约10倍。对于第六谐波（v(6)）和第八谐波（v(8)），报告了其幅度的上限。
