论文标题
在$ \ sqrt {s_ \ mathrm {nn}} = $ 5.02 TEV的PBPB碰撞中的$υ$（1s）和$υ$（2s）介子的偶然各向异性的测量
Measurement of the azimuthal anisotropy of $Υ$(1S) and $Υ$(2S) mesons in PbPb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV
论文作者
论文摘要
二阶傅立叶系数（$ v_2 $）表征了$υ$（1s）的方位角分布和$ 5.02 tev tev tev的$υ$（1s）和$ 5.02 tev。 $υ$介子是由CMS检测器衡量的Dimuon衰减通道中重建的。数据集对应于1.7 NB $^{ - 1} $的集成光度。标量产品方法用于提取方位角分布的$ V_2 $系数。报告了速度范围的$ | y | $ $ \ lt $ 2.4的结果，横向动量0 $ \ lt $ $ $ $ p_ \ mathrm {t} $ $ \ lt $ 50 GEV/$ C $，在三个中心范围内，为10-30％，30-50-50％和50-90％。与j/$ψ$介子相反，发现$υ$ meson的测量$ v_2 $值与零一致。
The second-order Fourier coefficients ($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.
