NA 60实验测量了在158 AGeV的In-In碰撞中产生的双μ子。本文提出了一种高统计测量的$ϕ\toμμ$的具体目标，以提供洞察的$ϕ$之谜，即在逆$T$斜率和绝对产额的差异NA 49和NA 50测量的K介子和轻子通道，分别。横向动量分布作为中心性的函数进行了研究。斜率参数$T$随中心性迅速增加，随后达到饱和。观测到$T$的变化，其拟合范围为15 MeV，这可能是径向流的结果。标准化到参与者数量的$ϕ$介子产额随着中心性而增加，并且在任何中心性下都始终高于NA 49实验测量的产额。
英文摘要：
The NA60 experiment measured dimuon production in In-In collisions at 158 AGeV. This paper presents a high statistics measurement of $ϕ\toμμ$ with the specific objective to provide insight on the $ϕ$ puzzle, i.e. the difference in the inverse $T$ slopes and absolute yields measured by NA49 and NA50 in the kaon and lepton channel, respectively. Transverse momentum distributions were studied as a function of centrality. The slope parameter $T$ shows a rapid increase with centrality, followed by a saturation. Variations of $T$ with the fit range of the order of 15 MeV were observed, possibly as a consequence of radial flow. The $ϕ$ meson yield normalized to the number of participants increases with centrality and is consistently higher than the yield measured by the NA49 experiment at any centrality.
The LUCIAE model predictions on the light vector meson production in proton-proton, proton-nucleus and nucleus-nucleus collisions at 158 A GeV
用LUCIAE模型对158 A GeV pp、p+Pb和Pb+Pb碰撞中产生的光矢量介子（$ρ,ω,ϕ$）进行了预测，并与实验结果进行了比较.该模型再现了数据的一般趋势，但未能描述中心Pb+Pb碰撞中高$p_T$矢量介子的产额。对158 AGeV的In+In和p+A（A从Be到U变化）碰撞也作了预测。
Anisotropy Scaling Functions in Heavy-Ion Collisions: Insights into the `Ultra-Central Flow Puzzle' and Constraints on Transport Coefficients and Nuclear Deformation
Measurement of azimuthal correlations of D mesons and charged particles in pp collisions at $\sqrt{s}=7$ TeV and p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV
Investigating Heavy-flavor vs Light-flavor Puzzle with Event Topology and Multiplicity in Proton+Proton Collisions at $\sqrt{s}$ = 13 TeV using PYTHIA8
