论文标题
关闭LHC Energies的关键网络 - 巴里昂波动：累积在PB $ -PB碰撞中最高三阶
Closing in on critical net-baryon fluctuations at LHC energies: cumulants up to third order in Pb$-$Pb collisions
论文作者
论文摘要
波动测量是有关LHC能量颗粒产生机理的重要信息来源。本文报道了在质量中心能量$ \ sqrt {s _ {\ rm nn}} = 5.02 $ tev记录的Alice Detector记录的质量中心$ \ sqrt {s _ {s _ {s _ {s _ {s _ {s _ {s _ {s _ {s _ {s _ sqrt {s collisisions in net-proton发行物的第一个实验结果。据全球和本地巴里昂编号保护造成的效果，还讨论了$ \ sqrt {s _ {\ rm nn}} = 2.76 $和$ 5.02 $ tev的Net-Proton发行物的二阶累积量的结果。结果表明，质子和抗蛋白酶之间存在远距离的速度相关性。这种相关性来自碰撞的早期阶段。将实验结果与Hijing和EPOS模型计算进行了比较，并且在晶格量子染色体动力学（LQCD）和强子共振气体（HRG）模型估计的背景下检查了波动测量对相空间覆盖的依赖性。测得的三阶累积物与实验不确定性的零一致，约为4％，通过LQCD和HRG预测很好地描述了。
Fluctuation measurements are important sources of information on the mechanism of particle production at LHC energies. This article reports the first experimental results on third-order cumulants of the net-proton distributions in Pb$-$Pb collisions at a center-of-mass energy $\sqrt{s_{\rm NN}} = 5.02$ TeV recorded by the ALICE detector. The results on the second-order cumulants of net-proton distributions at $\sqrt{s_{\rm NN}} = 2.76$ and $5.02$ TeV are also discussed in view of effects due to the global and local baryon number conservation. The results demonstrate the presence of long-range rapidity correlations between protons and antiprotons. Such correlations originate from the early phase of the collision. The experimental results are compared with HIJING and EPOS model calculations, and the dependence of the fluctuation measurements on the phase-space coverage is examined in the context of lattice quantum chromodynamics (LQCD) and hadron resonance gas (HRG) model estimations. The measured third-order cumulants are consistent with zero within experimental uncertainties of about 4% and are described well by LQCD and HRG predictions.
