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Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Řež u Prahy, Czech Republic.
Phys Rev Lett. 2016 Jun 3;116(22):222302. doi: 10.1103/PhysRevLett.116.222302.
The pseudorapidity density of charged particles, dN_{ch}/dη, at midrapidity in Pb-Pb collisions has been measured at a center-of-mass energy per nucleon pair of sqrt[s_{NN}]=5.02 TeV. For the 5% most central collisions, we measure a value of 1943±54. The rise in dN_{ch}/dη as a function of sqrt[s_{NN}] is steeper than that observed in proton-proton collisions and follows the trend established by measurements at lower energy. The increase of dN_{ch}/dη as a function of the average number of participant nucleons, ⟨N_{part}⟩, calculated in a Glauber model, is compared with the previous measurement at sqrt[s_{NN}]=2.76 TeV. A constant factor of about 1.2 describes the increase in dN_{ch}/dη from sqrt[s_{NN}]=2.76 to 5.02 TeV for all centrality classes, within the measured range of 0%-80% centrality. The results are also compared to models based on different mechanisms for particle production in nuclear collisions.
在质心能量每核子对为(\sqrt[s_{NN}]=5.02) TeV的铅-铅碰撞中，测量了中快度处带电粒子的赝快度密度(dN_{ch}/dη)。对于5%最中心的碰撞，我们测得的值为(1943±54)。(dN_{ch}/dη)随(\sqrt[s_{NN}])的上升比在质子-质子碰撞中观察到的更陡，并且遵循在较低能量下测量所确立的趋势。将(dN_{ch}/dη)作为在格拉肖模型中计算的参与核子平均数量(\langle N_{part}\rangle)的函数的增加，与之前在(\sqrt[s_{NN}]=2.76) TeV时的测量结果进行了比较。在测量的0% - 80%中心度范围内，一个约为1.2的常数因子描述了所有中心度类别中(dN_{ch}/dη)从(\sqrt[s_{NN}]=2.76) TeV到5.02 TeV的增加。还将结果与基于核碰撞中粒子产生的不同机制的模型进行了比较。
