arXiv 2006.077072020-06hep-exnucl-ex

$\sqrt{s_\mathrm{NN}} =$ 5.02 TeV的PbPb碰撞中$Υ$（1 S）和$Υ$（2S）介子方位角各向异性的测量

Measurement of the azimuthal anisotropy of $Υ$(1S) and $Υ$(2S) mesons in PbPb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV

CMS Collaboration

备注：: Replaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-19-002 (CMS Public Pages)
发表信息：: Phys. Lett. B 819 (2021) 136385
DOI：: 10.1016/j.physletb.2021.136385

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摘要：

研究了由$\sqrt{s_\mathrm{NN}} =$ 5.02 TeV的PbPb碰撞产生的$Υ$（1 S）和$Υ$（2S）介子的方位角分布的二阶傅里叶系数（$v_2$）. $Υ$介子在其双μ子衰变通道中重建，如CMS检测器所测量的。该数据集对应于1.7 nb $^{-1}$的积分光度。采用标量积方法提取方位角分布的$v_2$系数。结果报告的快度范围$|y|$ $\lt$ 2.4，与横向动量0 $\lt$ $p_\mathrm{T}$ $\lt$ 50 GeV/ $c$，并在三个中心的范围为10- 30%，30-50%和50- 90%。与J/ $ψ$介子相反，$Υ$介子的测量$v_2$值与零一致。

英文摘要：

The second-order Fourier coefficients ($v_2$) characterizing the azimuthal distribution of $Υ$(1S) and $Υ$(2S) mesons arising from PbPb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV are studied. The $Υ$ mesons are reconstructed in their dimuon decay channel, as measured by the CMS detector. The data set corresponds to an integrated luminosity of 1.7 nb$^{-1}$. The scalar product method is used to extract the $v_2$ coefficients of the azimuthal distribution. Results are reported for the rapidity range $|y|$ $\lt$ 2.4, with the transverse momentum 0 $\lt$ $p_\mathrm{T}$ $\lt$ 50 GeV/$c$, and in three centrality ranges of 10-30%, 30-50% and 50-90%. In contrast to the J/$ψ$ mesons, the measured $v_2$ values for the $Υ$ mesons are found to be consistent with zero.

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