论文标题
p-pb和pb-pb碰撞中的$ \ sqrt {s _ {\ rm nn}} $ = 5.02 tev tev
Azimuthal anisotropy of jet particles in p-Pb and Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV
论文作者
论文摘要
在$ \ sqrt {s _ {s _ {\ rm nn}} $ = 5.02 tev tev tev down to thervessemmmentmmment to to TresseverMomkum（$ p _ c $ c $ c rm tm t} $ c c，$ c rm c rm c rm c rm c rm c c c，在P-PB和PB-PB碰撞中首次测量与JET（喷气颗粒）相关的颗粒（喷气颗粒）的方位角各向异性。分别与爱丽丝。 P-PB碰撞中获得的结果基于一种新型的三粒子相关技术。方位角各向异性系数$ v_2 $ in High-Multiplicity P-PB碰撞是积极的，其显着性达到6.8 $σ$，低$ p _ {\ rm t} $，其幅度小于半居中的PB-PB碰撞。与PB-PB碰撞中的测量值相反，还发现$ v_2 $系数在不确定性内独立于$ p _ {\ rm t} $。讨论了与包含带电的粒子$ v_2 $的比较以及与AMPT计算的比较。这些预测表明，Parton相互作用在生成非零的喷气粒子$ v_2 $在P-PB碰撞中起着重要作用，即使它们高估了报告的测量值。这些观察结果就对小型系统（例如P-PB碰撞）的集体行为起源的理解的理解提供了新的见解，并对模型提供了严格的新约束。
The azimuthal anisotropy of particles associated with jets (jet particles) at midrapidity is measured for the first time in p-Pb and Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV down to transverse momentum ($p_{\rm T}$) of 0.5 GeV/$c$ and 2 GeV/$c$, respectively, with ALICE. The results obtained in p-Pb collisions are based on a novel three-particle correlation technique. The azimuthal anisotropy coefficient $v_2$ in high-multiplicity p-Pb collisions is positive, with a significance reaching 6.8$σ$ at low $p_{\rm T}$, and its magnitude is smaller than in semicentral Pb-Pb collisions. In contrast to the measurements in Pb-Pb collisions, the $v_2$ coefficient is also found independent of $p_{\rm T}$ within uncertainties. Comparisons with the inclusive charged-particle $v_2$ and with AMPT calculations are discussed. The predictions suggest that parton interactions play an important role in generating a non-zero jet-particle $v_2$ in p-Pb collisions, even though they overestimate the reported measurement. These observations shed new insights on the understanding of the origin of the collective behaviour of jet particles in small systems such as p-Pb collisions, and provide significant stringent new constraints to models.
