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arXiv 1607.00488hep-phhep-exnucl-exnucl-th
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从2.76 TeV的$pp$和Pb-Pb碰撞的带电粒子谱中提取的事件模式(粒子散点图)

Event patterns (particle scatter plots) extracted from charged particle spectra in $pp$ and Pb-Pb collisions at 2.76 TeV

Ya-Hui Chen, Fu-Hu Liu, Sakina Fakhraddin, Magda A. Rahim, Mai-Ying Duan

摘要:

用混合模型描述了在大型强子对撞机(LHC)上质子-质子($pp$)和铅-铅(Pb-Pb)碰撞中产生的带电粒子的横动量谱($p_T$)和赝快度谱($η$)。在该模型中,$p_T$谱由一个包含QCD(量子色动力学)微积分建议的逆幂律分布和一个由多谱热模型产生的Erlang分布的两分量分布描述。$η$谱由Landau流体动力学模型的高斯快度($y$)分布和二分量$p_T$分布描述,其中精确地考虑了$y$和$η$之间的转换。模拟结果与ATLAS合作组在$pp$碰撞中测量的质心能量为$\sqrt{s}=2.76$ TeV的实验数据和在Pb-Pb碰撞中测量的质心能量为每核子对$\sqrt{s_{NN}}=2.76$ TeV的实验数据一致。根据从$p_T$和$η$或$y$谱中提取的参数值,得到三维速度和动量空间中的事件模式或粒子散布图。

英文摘要:

The transverse momentum ($p_T$) and pseudorapidity ($η$) spectra of charged particles produced in proton-proton ($pp$) and lead-lead (Pb-Pb) collisions at the large hadron collider (LHC) are described by a hybrid model. In the model, the $p_T$ spectrum is described by a two-component distribution which contains an inverse power-law suggested by the QCD (Quantum Chromodynamic) calculus and an Erlang distribution resulted from a multisource thermal model. The $η$ spectrum is described by a Gaussian rapidity ($y$) distribution resulted from the Landau hydrodynamic model and the two-component $p_T$ distribution, where the conversion between $y$ and $η$ is accurately considered. The modelling results are in agreement with the experimental data measured by the ATLAS Collaboration in $pp$ collisions at center-of-mass energy $\sqrt{s}=2.76$ 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 $η$ or $y$ spectra, the event patterns or particle scatter plots in three-dimensional velocity and momentum spaces 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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