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arXiv 1502.01393hep-exnucl-ex
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LHC能区p-p和Pb-Pb碰撞中的两粒子关联和量子数守恒

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

Gyula Bencédi, Gergely Gábor Barnaföldi, Levente Molnár

摘要:

在本文中,我们继续调查的量子数守恒的影响,介子,K介子和质子,非常高的横动量(高达25 GeV/c),在部分子碎裂和强子化在p-p和Pb-Pb碰撞在LHC能量。通过在中快度区($|η| < 1$)的蒙特卡罗事件中识别出的两粒子关联,研究了守恒效应的强度。模拟的p-p事件是用PYTHIA 8生成的,使用其主要默认设置,在$\sqrt{s}=200$ ~GeV、$\sqrt{s}=2.76$ ~TeV、$\sqrt{s}=7$ ~TeV和$\sqrt{s}=14$ ~TeV。与此同时,HIJING 1.36被用来产生中心度为$0-10\%$、$30-40\%$和$80-90\%$的$\sqrt{s_{\rm NN}}=2.76$ ~TeV的Pb-Pb事例。所提取的带电π介子、K介子和质子的关联强子谱表明,在任何核-核碰撞中,带相反电荷的关联粒子物种之间的关联强子依赖分裂。Pb-Pb数据表现出一种特殊的分裂模式,作为关联粒子$p_{T,assoc}$在近侧和远侧的横向动量的函数,这与在p-p碰撞中观察到的模式不同。在p-p碰撞中,劈裂随碰撞能量和事例多数的变化表现出平滑的演化,而在Pb-Pb碰撞中,对K介子和质子则表现出不同的变化趋势。

英文摘要:

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 ($|η| < 1$). 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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