标题： 前向-中心双粒子关联在LHC的ALICE实验中质子-铅碰撞中的研究 显示英文标题

标题： Forward-central two-particle correlations in p--Pb collisions with ALICE at the LHC

摘要： 我们展示了在质子-铅碰撞中，通过ALICE前向缪子谱仪（$-4.0 < \eta < -2.5$）重建的触发粒子与中心桶形探测器（$|\eta| < 1.0$）重建的关联粒子之间的双粒子角度相关性的测量结果，在核子-核子质心系能量为5.02 TeV的情况下。在低横向动量（$p_{\mathrm{T}}$）下，重建的触发粒子主要来源于初生介子和K介子的弱衰变，而在高$p_{\mathrm{T}}$下，它们主要来源于重味粒子的衰变。最近在质子-铅碰撞中发现的沿$\eta$方向延伸的脊状结构，在这里研究的赝快度范围内仍然存在。在从高多重性事件的相关性中减去低多重性事件的相关性后，提取了缪子的二阶傅里叶系数。 Pb-going方向和p-going方向的系数比值作为$p_{\mathrm{T}}$的函数给出，观察到两种方向的系数具有相似的$p_{\mathrm{T}}$依赖性，其中Pb-going方向的系数大16$\pm$6%。 结果与多相输运模型的计算结果进行了比较。 显示英文摘要

摘要： We present the results of measurements of two-particle angular correlations between trigger particles reconstructed in the ALICE Forward Muon Spectrometer ($-4.0 < \eta < -2.5$) and associated particles reconstructed in the central barrel detectors ($|\eta| < 1.0$) in p--Pb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. At low transverse momentum ($p_{\mathrm{T}}$), the reconstructed trigger particles mainly originate from weak decays of primary pions and kaons, whereas at high $p_{\mathrm{T}}$, they originate mainly from the decay of heavy-flavor particles. The ridge structure elongated in the $\eta$-direction, discovered recently in p--Pb collisions, is found to persist to the pseudorapidity ranges studied here. The second-order Fourier coefficients of muons are extracted after subtracting the correlations obtained in low-multiplicity events from those in high-multiplicity events. The ratio of coefficients in the Pb-going and p-going directions is presented as a function of $p_{\mathrm{T}}$, and the coefficients are observed to have a similar $p_{\mathrm{T}}$ dependence in both directions with the Pb-going coefficients larger by 16$\pm$6\%. The results are compared with calculations from a multi-phase transport model.