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Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
Phys Rev Lett. 2006 Jan 13;96(1):012304. doi: 10.1103/PhysRevLett.96.012304. Epub 2006 Jan 10.
J/psi production in d + Au and p + p collisions at square root of S(NN) = 200 GeV has been measured by the PHENIX experiment at rapidities -2.2 < y < +2.4. The cross sections and nuclear dependence of J/psi production versus rapidity, transverse momentum, and centrality are obtained and compared to lower energy p + A results and to theoretical models. The observed nuclear dependence in d + Au collisions is found to be modest, suggesting that the absorption in the final state is weak and the shadowing of the gluon distributions is small and consistent with Dokshitzer-Gribov-Lipatov-Altarelli-Parisi-based parametrizations that fit deep-inelastic scattering and Drell-Yan data at lower energies.
在√S(NN)=200 GeV的d+Au和p+p碰撞中J/ψ产生情况已由PHENIX实验在快度-2.2<y<+2.4下进行了测量。获得了J/ψ产生的截面及其相对于快度、横向动量和中心度的核依赖性，并与较低能量下的p+A结果以及理论模型进行了比较。发现在d+Au碰撞中观察到的核依赖性较小，这表明末态吸收较弱，胶子分布的遮蔽效应较小，并且与基于Dokshitzer-Gribov-Lipatov-Altarelli-Parisi的参数化一致，该参数化能拟合较低能量下的深度非弹性散射和Drell-Yan数据。
