论文标题
PPB和PBPB碰撞中奇怪的强子集体集合
Strange hadron collectivity in pPb and PbPb collisions
论文作者
论文摘要
K $^0_ \ MATHRM {s} $和$λ/\barλ$奇怪的Hadrons的集体行为是通过使用标量 - 产品和多部分相关方法来测量椭圆方代方差各向异性（$ v_2 $）来研究的。 Proton-lead (pPb) collisions at a nucleon-nucleon center-of-mass energy $\sqrt{s_\mathrm{NN}}$ = 8.16 TeV and lead-lead (PbPb) collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV collected by the CMS experiment at the LHC are investigated.通过使用亚事件累积分析，排除存在大于20 \ gev的射流的事件，研究了PPB碰撞中的非流量效应。发现通过四粒子和六粒子相关方法在\ ppb碰撞中提取的奇怪的强子$ V_2 $值几乎相同，这表明集体行为。 PPB和PBPB的比较结果与奇怪的黑龙和带电的颗粒的结果说明了逐事事件的流动波动如何取决于系统大小。
The collective behavior of K$^0_\mathrm{S}$ and $Λ/\barΛ$ strange hadrons is studied by measuring the elliptic azimuthal anisotropy ($v_2$) using the scalar-product and multiparticle correlation methods. Proton-lead (pPb) collisions at a nucleon-nucleon center-of-mass energy $\sqrt{s_\mathrm{NN}}$ = 8.16 TeV and lead-lead (PbPb) collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV collected by the CMS experiment at the LHC are investigated. Nonflow effects in the pPb collisions are studied by using a subevent cumulant analysis and by excluding events where a jet with transverse momentum greater than 20\GeV is present. The strange hadron $v_2$ values extracted in \pPb collisions via the four- and six-particle correlation method are found to be nearly identical, suggesting the collective behavior. Comparisons of the pPb and PbPb results for both strange hadrons and charged particles illustrate how event-by-event flow fluctuations depend on the system size.
