Back B B, Baker M D, Barton D S, Betts R R, Bindel R, Budzanowski A, Busza W, Carroll A, Decowski M P, Garcia E, George N, Gulbrandsen K, Gushue S, Halliwell C, Hamblen J, Henderson C, Hofman D, Hollis R S, Hołyński R, Holzman B, Iordanova A, Johnson E, Kane J, Katzy J, Khan N, Kucewicz W, Kulinich P, Kuo C M, Lin W T, Manly S, McLeod D, Michałowski J, Mignerey A, Nouicer R, Olszewski A, Pak R, Park I C, Pernegger H, Reed C, Remsberg L P, Reuter M, Roland C, Roland G, Rosenberg L, Sagerer J, Sarin P, Sawicki P, Skulski W, Steadman S G, Steinberg P, Stephans G S F, Stodulski M, Sukhanov A, Tang J-L, Teng R, Trzupek A, Vale C, Van Nieuwenhuizen G J, Verdier R, Wadsworth B, Wolfs F L H, Wosiek B, Woźniak K, Wuosmaa A H, Wysłouch B
Physics Division, Argonne National Laboratory, Illinois 60439-4843, USA.
Phys Rev Lett. 2002 Nov 25;89(22):222301. doi: 10.1103/PhysRevLett.89.222301. Epub 2002 Nov 7.
This paper describes the measurement of collective flow for charged particles in Au+Au collisions at sqrt[s(NN)]=130 GeV using the PHOBOS detector at the Relativistic Heavy Ion Collider (RHIC). The measured azimuthal hit anisotropy is presented over a wide range of pseudorapidity (-5.0<eta<5.3) for the first time at this energy. The result, averaged over momenta and particle species, is observed to reach 7% for peripheral collisions at midrapidity, falling off with centrality and increasing |eta|. These results call into question the common assumption of longitudinal boost invariance over a large region of rapidity in RHIC collisions.
本文描述了在相对论重离子对撞机（RHIC）上，利用PHENIX探测器对金离子与金离子在质心能量sqrt[s(NN)] = 130 GeV的碰撞中带电粒子的集体流进行测量。首次在该能量下，给出了在很宽的赝快度范围（-5.0 < η < 5.3）内测量到的方位角碰撞各向异性。对动量和粒子种类进行平均后的结果表明，在中快度处，周边碰撞的该值达到7%，并随中心度增加和|η|增大而下降。这些结果对RHIC碰撞中在大快度区域内纵向快度不变性的普遍假设提出了质疑。
