用ATLAS实验研究5.02 TeV Pb+Pb碰撞中高横动量下的瞬发和非瞬发$J/ψ$和$ψ(2\mathrm{S})$的抑制
Prompt and non-prompt $J/ψ$ and $ψ(2\mathrm{S})$ suppression at high transverse momentum in 5.02 TeV Pb+Pb collisions with the ATLAS experiment
摘要：
提供了$J/ψ$和$ψ(2\mathrm{S})$生产的测量。它基于2015年在LHC的ATLAS探测器记录的$\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV的Pb+Pb碰撞和$\sqrt{s}$ = 5.02 TeV的$pp$碰撞的数据样本，分别对应于Pb+Pb和$pp$中的$0.42\mathrm{nb}^{-1}$和$25\mathrm{pb}^{-1}$的积分光度。在双μ子衰变道中测量了双μ子横动量为$9 < p_{T}^{μμ} < 40$ GeV，快度为$-2.0 < y_{μμ} < 2.0$的每事件产额、核修改因子和非瞬发分数。强抑制被发现在Pb+Pb碰撞的提示和非提示$J/ψ$，以及提示和非提示$ψ(2\mathrm{S})$，增加与事件中心。在不确定性范围内，观察到对瞬发$ψ(2\mathrm{S})$的抑制比对$J/ψ$的抑制更强，而对非瞬发$ψ(2\mathrm{S})$的抑制与对非瞬发$J/ψ$的抑制相等，这与预期一致，即两者都是由通过介质传播的\textit{b} -夸克引起的。尽管提示和非提示$J/ψ$产生于不同的机制，其核修饰因子对中心性的依赖性被发现是非常相似的。
英文摘要：
A measurement of $J/ψ$ and $ψ(2\mathrm{S})$ production is presented. It is based on a data sample from Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV and $pp$ collisions at $\sqrt{s}$ = 5.02 TeV recorded by the ATLAS detector at the LHC in 2015, corresponding to an integrated luminosity of $0.42\mathrm{nb}^{-1}$ and $25\mathrm{pb}^{-1}$ in Pb+Pb and $pp$, respectively. The measurements of per-event yields, nuclear modification factors, and non-prompt fractions are performed in the dimuon decay channel for $9 < p_{T}^{μμ} < 40$ GeV in dimuon transverse momentum, and $-2.0 < y_{μμ} < 2.0$ in rapidity. Strong suppression is found in Pb+Pb collisions for both prompt and non-prompt $J/ψ$, as well as for prompt and non-prompt $ψ(2\mathrm{S})$, increasing with event centrality. The suppression of prompt $ψ(2\mathrm{S})$ is observed to be stronger than that of $J/ψ$, while the suppression of non-prompt $ψ(2\mathrm{S})$ is equal to that of the non-prompt $J/ψ$ within uncertainties, consistent with the expectation that both arise from \textit{b}-quarks propagating through the medium. Despite prompt and non-prompt $J/ψ$ arising from different mechanisms, the dependence of their nuclear modification factors on centrality is found to be quite similar.
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