arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1901.00744nucl-exhep-ex
收藏

在ALICE上研究Pb-Pb碰撞中守恒电荷与净$Λ$涨落的关联涨落

Investigating correlated fluctuations of conserved charges with net-$Λ$ fluctuations in Pb-Pb collisions at ALICE

Alice Ohlson

摘要:

在超相对论性重离子碰撞中,守恒电荷(如电荷、奇异性和重子数)的逐事件涨落提供了对夸克-胶子等离子体性质和QCD相图的深入了解。它们可能与已识别粒子的多重数分布的高阶矩有关,例如$Λ$重子,它同时具有奇异性和重子数,因此特别令人感兴趣。我们提出了第一次测量净$Λ$波动的铅铅碰撞在$\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV的函数的中心性和赝快度接受的测量。结果进行了比较,全球重子数守恒的影响,以及从HIJING蒙特卡罗事件发生器的预测的预期。在这种分析中,同一性方法应用在一种新的方式来占不变质量分布的组合背景。

英文摘要:

Event-by-event fluctuations of conserved charges - such as electric charge, strangeness, and baryon number - in ultrarelativistic heavy-ion collisions provide insight into the properties of the quark-gluon plasma and the QCD phase diagram. They can be related to the higher moments of the multiplicity distributions of identified particles, such as the $Λ$ baryon which carries both strangeness and baryon number and is thus of particular interest. We present the first measurement of net-$Λ$ fluctuations in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV as a function of centrality and the pseudorapidity acceptance of the measurement. The results are compared to expectations of the effects of global baryon number conservation as well as to predictions from the HIJING Monte Carlo event generator. In this analysis the Identity Method is applied in a novel way to account for the combinatoric background in the invariant mass distribution.

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。

↑