"Table 15" of "Long-range two-particle correlations of strange hadrons with charged particles in pPb and PbPb collisions at LHC energies"

CERN-LHC. Measurements of two-particle angular correlations between an identified strange hadron (K0S or Lambda/anti-Lambda) and a charged particle, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 35 inverse nanobarns, were collected at a nucleon-nucleon center-of-mass energy (sqrt(s[NN])) of 5.02 TeV with the CMS detector at the LHC. The results are compared to semi-peripheral PbPb collision data at sqrt(s[NN]) = 2.76 TeV, covering similar charged-particle multiplicities in the events. The observed azimuthal correlations at large relative pseudorapidity are used to extract the second-order (v[2]) and third-order (v[3]) anisotropy harmonics of K0S and Lambda/anti-Lambda particles. These quantities are studied as a function of the charged-particle multiplicity in the event and the transverse momentum of the particles. For high-multiplicity pPb events, a clear particle species dependence of v[2] and v[3] is observed. For pt < 2 GeV, the v[2] and v[3] values of K0S particles are larger than those of Lambda/anti-Lambda particles at the same pt. This splitting effect between two particle species is found to be stronger in pPb than in PbPb collisions in the same multiplicity range. When divided by the number of constituent quarks and compared at the same transverse kinetic energy per quark, both v[2] and v[3] for K0S particles are observed to be consistent with those for Lambda/anti-Lambda particles at the 10% level in pPb collisions. This consistency extends over a wide range of particle transverse kinetic energy and event multiplicities.

欧洲核子研究中心大型强子对撞机（CERN-LHC）相关数据集报道了质子-铅（pPb）碰撞中，已识别奇异强子（K0_S或Lambda/anti-Lambda）与带电粒子间的双粒子角关联测量结果，测量覆盖了较宽的赝快度（pseudorapidity）范围与全方位角区间。该数据集对应的积分亮度（integrated luminosity）约为35纳靶恩⁻¹，采集于大型强子对撞机（LHC）上的CMS探测器（Compact Muon Solenoid），对应的核子-核子质心系能量为√s_NN=5.02 TeV。研究团队将本次测量结果与√s_NN=2.76 TeV下的半外围铅-铅（PbPb）碰撞数据进行对比，后者的事件带电粒子多重数范围与本次测量相近。通过分析大相对赝快度区间内观测到的方位角关联，研究人员提取得到K0_S及Lambda/anti-Lambda粒子的二阶（v₂）与三阶（v₃）各向异性流谐波。本研究以事件带电粒子多重数与粒子横动量（transverse momentum）为变量，对上述各向异性流参数展开分析。在高多重数pPb碰撞事件中，观测到v₂与v₃存在显著的粒子种类依赖性。当粒子横动量p_t<2 GeV时，相同横动量下K0_S粒子的v₂与v₃值均大于Lambda/anti-Lambda粒子。在相同多重数区间内，这两种粒子间的分裂效应在pPb碰撞中比PbPb碰撞中更为显著。将各粒子的各向异性流参数按组成夸克数（constituent quarks）归一化后，在相同夸克横向动能条件下进行对比，pPb碰撞中K0_S粒子的v₂与v₃值与Lambda/anti-Lambda粒子的对应参数在10%的误差范围内保持一致。该一致性覆盖了较宽的粒子横向动能范围与事件多重数区间。