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University of Colorado, Boulder, Colorado 80309, USA.
Phys Rev Lett. 2007 Jun 8;98(23):232301. doi: 10.1103/PhysRevLett.98.232301. Epub 2007 Jun 4.
The PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC) has measured J/psi production for rapidities -2.2<y<2.2 in Au+Au collisions at square root sNN=200 GeV. The J/psi invariant yield and nuclear modification factor RAA as a function of centrality, transverse momentum, and rapidity are reported. A suppression of J/psi relative to binary collision scaling of proton-proton reaction yields is observed. Models which describe the lower energy J/psi data at the CERN Super Proton Synchrotron invoking only J/psi destruction based on the local medium density predict a significantly larger suppression at RHIC and more suppression at midrapidity than at forward rapidity. Both trends are contradicted by our data.
位于布鲁克海文国家实验室相对论重离子对撞机（RHIC）的PHENIX实验，测量了在质心能量平方根sNN = 200 GeV的金金碰撞中，快度-2.2 < y < 2.2范围内J/ψ粒子的产生情况。报告了J/ψ粒子的不变产额以及作为中心度、横向动量和快度函数的核修正因子RAA。观察到J/ψ粒子相对于质子-质子反应产额的二元碰撞标度存在抑制现象。仅基于局部介质密度的J/ψ粒子破坏来描述欧洲核子研究中心超级质子同步加速器较低能量J/ψ数据的模型预测，在RHIC能区会有显著更大的抑制，并且在中快度处的抑制比前向快度处更大。这两种趋势均与我们的数据相矛盾。
