Chaudhuri A K
Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Calcutta-700 064, India.
Phys Rev Lett. 2002 Jun 10;88(23):232302. doi: 10.1103/PhysRevLett.88.232302. Epub 2002 May 24.
We have analyzed the latest NA50 data on J/psi suppression in Pb + Pb collisions. J/psi production is assumed to be a two-step process: (i) formation of a cc- pair, which is accurately calculable in QCD, and (ii) formation of a J/psi meson from the cc- pair, which can be conveniently parametrized. The parameters of the model were fixed from experimental data on the total J/psi cross section as a function of effective nuclear length. The model gives an excellent description of NA50 data on the ET dependence of the J/psi-to-Drell-Yan ratio. It was applied to the ET dependence of J/psi at RHIC energies, and predicts a much larger suppression of J/psi, in agreement with other model calculations.
我们分析了关于铅离子与铅离子碰撞中J/ψ抑制的最新NA50数据。J/ψ产生被假定为一个两步过程：(i)粲夸克对的形成，这在量子色动力学中可以精确计算，以及(ii)从粲夸克对形成J/ψ介子，这可以方便地进行参数化。该模型的参数根据作为有效核长度函数的总J/ψ截面的实验数据来确定。该模型对NA50关于J/ψ与德雷尔-杨产额比的横能量依赖性的数据给出了出色的描述。它被应用于相对论重离子对撞机能量下J/ψ的横能量依赖性，并预测J/ψ的抑制要大得多，这与其他模型计算结果一致。
