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Zhalov M, Zhang B, Zhang C, Zhang L, Zhang S, Zhang X, Zhang Y, Zhang Z, Zhao M, Zherebchevskii V, Zhi Y, Zhou D, Zhou Y, Zhu J, Zhu Y, Zugravel S C, Zurlo N
Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
Nuclear Physics Institute of the Czech Academy of Sciences, Husinec-Řež, Czech Republic.
Phys Rev Lett. 2024 Apr 19;132(16):162302. doi: 10.1103/PhysRevLett.132.162302.
The first measurement of the cross section for incoherent photonuclear production of J/ψ vector mesons as a function of the Mandelstam |t| variable is presented. The measurement was carried out with the ALICE detector at midrapidity, |y|<0.8, using ultraperipheral collisions of Pb nuclei at a center-of-mass energy per nucleon pair of sqrt[s_{NN}]=5.02 TeV. This rapidity interval corresponds to a Bjorken-x range (0.3-1.4)×10^{-3}. Cross sections are given in five |t| intervals in the range 0.04<|t|<1 GeV^{2} and compared to the predictions by different models. Models that ignore quantum fluctuations of the gluon density in the colliding hadron predict a |t| dependence of the cross section much steeper than in data. The inclusion of such fluctuations in the same models provides a better description of the data.
首次给出了J/ψ矢量介子非相干光致核产生截面作为曼德尔斯坦|t|变量的函数的测量结果。该测量是在质心能量为每核子对(\sqrt{s_{NN}} = 5.02) TeV的铅核超外围碰撞中，使用ALICE探测器在中快度（(|y| < 0.8)）下进行的。这个快度区间对应于布约肯-x范围((0.3 - 1.4)×10^{-3})。在(0.04 < |t| < 1) GeV²范围内的五个|t|区间给出了截面，并与不同模型的预测进行了比较。忽略碰撞强子中胶子密度量子涨落的模型预测截面的|t|依赖性比数据中的陡峭得多。在相同模型中考虑这种涨落能更好地描述数据。
