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arXiv 1304.2113hep-phhep-exnucl-ex
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重离子碰撞中的横向能量和带电粒子产生:从RHIC到LHC

Transverse energy and charged particle production in heavy-ion collisions: From RHIC to LHC

Raghunath Sahoo, Aditya Nath Mishra

摘要:

在核子和夸克参与者的框架下,研究了从AGS、SPS、RHIC到LHC的带电粒子和横能产生机制。在RHIC和LHC能区,核子归一化的带电粒子数和赝快度的横向能量密度随中心性单调增加,当归一化到参与夸克数时,它们是几乎与中心性无关的标度行为.一个对数和幂律相结合的普适函数很好地描述了整个碰撞能量范围内核子和夸克参与者水平上的带电粒子和横能量产生。在核子和部分子水平上讨论了与能量有关的产生机制。对$\sqrt{s_{\rm{NN}}}=5.5$ TeV的Pb+Pb碰撞中快度的横能、带电粒子多重数及其比值(气压观测值,$\frac{dE_{\rm{T}}/dη}{dN_{\rm{ch}}/dη} ~\equiv \frac{E_{\rm{T}}}{N_{\rm{ch}}}$)的赝快度密度进行了预测.对$\frac{E_{\rm{T}}}{N_{\rm{ch}}}$的能量依赖性与基于胶子饱和和统计强子气体的模型进行了比较。

英文摘要:

We study the charged particle and transverse energy production mechanism from AGS, SPS, RHIC to LHC energies in the framework of nucleon and quark participants. At RHIC and LHC energies, the number of nucleons-normalized charged particle and transverse energy density in pseudorapidity, which shows a monotonic rise with centrality, turns out to be an almost centrality independent scaling behaviour when normalized to the number of participant quarks. A universal function which is a combination of logarithmic and power-law, describes well the charged particle and transverse energy production both at nucleon and quark participant level for the whole range of collision energies. Energy dependent production mechanisms are discussed both for nucleonic and partonic level. Predictions are made for the pseudorapidity densities of transverse energy, charged particle multiplicity and their ratio (the barometric observable, $\frac{dE_{\rm{T}}/dη}{dN_{\rm{ch}}/dη} ~\equiv \frac{E_{\rm{T}}}{N_{\rm{ch}}}$) at mid-rapidity for Pb+Pb collisions at $\sqrt{s_{\rm{NN}}}=5.5$ TeV. A comparison with models based on gluon saturation and statistical hadron gas is made for the energy dependence of $\frac{E_{\rm{T}}}{N_{\rm{ch}}}$.

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