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arXiv 1012.1931nucl-th
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PACIAE模型中LHC能区p+p碰撞中的带电粒子椭圆流

Charged particle elliptic flow in p+p collisions at LHC energies in a transport model PACIAE

Dai-Mei Zhou, Yu-Liang Yan, Bao-Guo Dong, Xiao-Mei Li, Du-Juan Wang, Xu Cai, Ben-Hao Sa

摘要:

利用基于PYTHIA的部分子-强子级联模型PACIAE研究了LHC能区最小偏置pp碰撞中带电粒子的椭圆流。在部分子再散射前,这些弦随机分布在长轴为$R$(质子半径)、短轴为$R(1-ξ)$的pp碰撞系统的横向椭球中.研究了带电粒子椭圆流随随机数$ξ$和横向动量$p_T$的变化规律。计算的$v_2/ε$作为反应能的函数随着反应能的增加而单调增加,直到$\sqrt{s}\sim$ 7 TeV,然后转向饱和。在$\sqrt{s}$ =7 TeV的最小偏压pp碰撞中,当部分子再散射时,部分子-部分子截面增大3倍,在$p_T \sim$ 2 GeV/c时,快度积分带电粒子椭圆流可达0.025.

英文摘要:

The parton and hadron cascade model PACIAE based on PYTHIA was used to investigate the charged particle elliptic flow in minimum bias pp collisions at the LHC energies. The strings were distributed randomly in the transverse ellipsoid of the pp collision system with major axis of $R$ (proton radius) and minor axis of $R(1-ξ)$ before parton rescattering. The charged particle elliptic flow as a function of the random number $ξ$ and transverse momentum $p_T$ were investigated. The calculated $v_2/ε$ as a function of reaction energy increases monotonously with increasing reaction energy up to $\sqrt{s}\sim$7 TeV and then turns to saturation. With the parton-parton cross section enlarges three times in parton rescattering, the rapidity integrated charged particle elliptic flow may reach 0.025 at $p_T \sim$2 GeV/c in the minimum bias pp collisions at $\sqrt{s}$=7 TeV.

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