arXiv 1709.068072017-09nucl-exhep-ex

在$\sqrt{s_{\rm NN}}$ = 5.02和8.16 TeV的高多重数p-Pb碰撞中用方位角J/ $ψ$ -强子关联寻找集体性

Search for collectivity with azimuthal J/$ψ$-hadron correlations in high multiplicity p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 and 8.16 TeV

ALICE Collaboration

备注：: 22 pages, 6 captioned figures, 1 table, authors from page 17, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3841
发表信息：: Phys. Lett. B 780 (2018) 7-20
DOI：: 10.1016/j.physletb.2018.02.039

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摘要：

本文给出了用ALICE探测器在CERN LHC上记录的p-Pb碰撞中J/ $ψ$和带电强子之间的方位角关联的测量结果。J/ $ψ$通过它们的$μ^+μ^-$衰变道在前向（p-going，2.03 $<$ y $<$ 3.53）和后向（p-going，$-$ 4.46 $<$ y $-$ 2.96）快度下重建，而带电强子在中快度（$|η|$ $<$ 1.8）下重建。相关性表示为每个J/ $ψ$触发器的相关带电强子产额。在触发J/ $ψ$和相关的带电强子之间至少需要1.5个单位的快度间隙。可能的相关性，由于集体效应的评估，减去相关的每触发器在低多重性碰撞的产量从那些在高多重性碰撞。减法后，我们观察到一个强有力的迹象，剩余的对称结构在$Δφ$ $\approx$ 0和$Δφ$ $\approx$ $π$，类似于以前发现的两个粒子的相关性在中等和向前的速度。相应的二阶傅里叶系数（$v_2$）在3和6 GeV/ $c$之间的横向动量间隔被发现是积极的，约5 $σ$的意义。得到的结果与在$\sqrt{s_{\rm NN}}$ = 5.02 TeV的Pb-Pb碰撞中测得的J/ $ψ$ $v_2$系数相似，表明J/ $ψ$ $v_2$的起源有一个共同的机制.

英文摘要：

We present a measurement of azimuthal correlations between inclusive J/$ψ$ and charged hadrons in p-Pb collisions recorded with the ALICE detector at the CERN LHC. The J/$ψ$ are reconstructed at forward (p-going, 2.03 $<$ y $<$ 3.53) and backward (Pb-going, $-$4.46 $<$ y $<$ $-$2.96) rapidity via their $μ^+μ^-$ decay channel, while the charged hadrons are reconstructed at mid-rapidity ($|η|$ $<$ 1.8). The correlations are expressed in terms of associated charged-hadron yields per J/$ψ$ trigger. A rapidity gap of at least 1.5 units is required between the trigger J/$ψ$ and the associated charged hadrons. Possible correlations due to collective effects are assessed by subtracting the associated per-trigger yields in the low-multiplicity collisions from those in the high-multiplicity collisions. After the subtraction, we observe a strong indication of remaining symmetric structures at $Δφ$ $\approx$ 0 and $Δφ$ $\approx$ $π$, similar to those previously found in two-particle correlations at middle and forward rapidity. The corresponding second-order Fourier coefficient ($v_2$) in the transverse momentum interval between 3 and 6 GeV/$c$ is found to be positive with a significance of about 5$σ$. The obtained results are similar to the J/$ψ$ $v_2$ coefficients measured in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV, suggesting a common mechanism at the origin of the J/$ψ$ $v_2$.

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