标题： 在LHC能量下质子-质子和铅-铅碰撞中识别的两粒子关联和量子数守恒 显示英文标题

标题： Identified Two-particle Correlations and Quantum Number Conservations in p-p and Pb-Pb Collisions at LHC Energies

摘要： 在本文中，我们继续研究在LHC能量下质子-质子和铅-铅碰撞中的部分子碎片化和强子化过程中，π介子、K介子和质子的量子数守恒对具有非常高的横向动量（高达25 GeV/c）的影响。通过蒙特卡罗生成事件中识别的两粒子关联，在中间快速度区域（$|\eta| < 1$）研究了守恒效应的强度。模拟的质子-质子事件使用PYTHIA 8生成，采用其主要默认设置，在$\sqrt{s}=200$~GeV，$\sqrt{s}=2.76$~TeV，$\sqrt{s}=7$~TeV，和$\sqrt{s}=14$~TeV条件下生成。 与此同时，HIJING 1.36用于在$\sqrt{s_{\rm NN}}=2.76$~TeV下生成Pb-Pb事件，其中的中心性为$0-10\%$, $30-40\%$和$80-90\%$。 提取出的带电π介子、K介子和质子的已识别关联强子谱显示，在任何核-核碰撞中，不同电荷的关联粒子种类之间存在与已识别触发强子相关的分裂。 Pb-Pb数据在关联粒子的横向动量$p_{T,assoc}$上表现出独特的分裂模式，无论是近侧还是远侧，这与p-p碰撞中观察到的模式不同。 在p-p碰撞中，分裂随着碰撞能量和事件多重性平滑演变，而在Pb-Pb碰撞中，K介子和质子表现出不同的趋势。 显示英文摘要

摘要： In this paper we continue the investigation of the effect of quantum number conservations of pions, kaons, and protons, with very high transverse momenta (up to 25 GeV/c), during parton fragmentation and hadronization in p-p and Pb-Pb collisions at LHC energies. The strength of the conservation effects are studied by identified two-particle correlations in Monte Carlo generated events in the mid-rapidity region ($|\eta| < 1$). The simulated p-p events were generated with PYTHIA 8, using its main default settings, at $\sqrt{s}=200$~GeV, $\sqrt{s}=2.76$~TeV, $\sqrt{s}=7$~TeV, and $\sqrt{s}=14$~TeV. In parallel to this, HIJING 1.36 was used to generate Pb-Pb events at $\sqrt{s_{\rm NN}}=2.76$~TeV with centralities $0-10\%$, $30-40\%$ and $80-90\%$. The extracted identified associated hadron spectra for charged pion, kaon, and proton show identified trigger-hadron dependent splitting between oppositely charged associated particle species in any nucleus-nucleus collisions. The Pb-Pb data exhibits a peculiar splitting pattern as a function of the transverse momentum of the associated particle $p_{T,assoc}$ both on the near and away side that is different from the patterns observed in p-p collisions. The splitting shows smooth evolution with collision energy and event multiplicity in p-p collisions while in Pb-Pb collisions different trend were observed for kaons and protons.