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arXiv 1601.07072hep-phhep-exnucl-exnucl-th
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从LHC pp和Pb-Pb碰撞中产生的Z玻色子和夸克偶素态的横动量和快度谱中提取的事件图象

Event patterns extracted from transverse momentum and rapidity spectra of Z bosons and quarkonium states produced in pp and Pb-Pb collisions at LHC

Ya-Hui Chen, Fu-Hu Liu, Roy A. Lacey

摘要:

横动量($p_T$)和快速性$Z$玻色子和夸克偶素态的($y$)谱(一些粲鎓 $c\bar c$介子如$J/ψ$和$ψ(2S)$,和一些底鎓 $b\bar b$介子如$Υ(1S)$,$Υ(2S)$,和$Υ(3S)$)在质子-质子中产生本文用$p_T$谱的二分量Erlang分布和二分量Erlang分布的混合模型统一描述了在大型强子对撞机(LHC)上发生的铅-铅碰撞(Pb-Pb)和$pp$碰撞($pp$)。$y$谱的高斯分量分布。前一种分布是由多尺度热力学模型得到的,后一种分布是由修正的朗道水动力学模型得到的。模拟结果与质心能量为$\sqrt{s}=2.76$和7 TeV的$pp$碰撞以及每个核子对质心能量为$\sqrt{s_{NN}}=2.76$ TeV的Pb-Pb碰撞的实验数据一致。根据从$p_T$和$y$谱中提取的参数值,得到了二维$p_T$ - $y$空间和三维速度空间中的事件模式(粒子散点图)。

英文摘要:

Transverse momentum ($p_T$) and rapidity ($y$) spectra of $Z$ bosons and quarkonium states (some charmonium $c\bar c$ mesons such as $J/ψ$ and $ψ(2S)$, and some bottomonium $b\bar b$ mesons such as $Υ(1S)$, $Υ(2S)$, and $Υ(3S)$) produced in proton-proton ($pp$) and lead-lead (Pb-Pb) collisions at the large hadron collider (LHC) are uniformly described by a hybrid model of two-component Erlang distribution for $p_T$ spectrum and two-component Gaussian distribution for $y$ spectrum. The former distribution results from a multisource thermal model, and the latter one results from the revised Landau hydrodynamic model. The modelling results are in agreement with the experimental data measured in $pp$ collisions at center-of-mass energies $\sqrt{s}=2.76$ and 7 TeV, and in Pb-Pb collisions at center-of-mass energy per nucleon pair $\sqrt{s_{NN}}=2.76$ TeV. Based on the parameter values extracted from $p_T$ and $y$ spectra, the event patterns (particle scatter plots) in two-dimensional $p_T$-$y$ space and in three-dimensional velocity space are obtained.

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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