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arXiv 2012.05388hep-ph
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核胶子分布对重离子碰撞中粒子产生的作用

Role of nuclear gluon distribution on particle production in heavy ion collisions

L. S. Moriggi, G. M. Peccini, M. V. T. Machado

摘要:

在小$x$的$k_T$ -因子化框架下,由未积分胶子分布(UGD)计算了强子的横动量谱.从$pp$碰撞开始,核介质引起的改性在高能时被并入UGD,这与核遮蔽现象有关。此外,我们认为,由于硬碰撞后发生的集体现象,从微喷衰变的粒子生产是不足以解释$AA$碰撞的$p_T$光谱。利用玻尔兹曼-吉布斯爆炸波(BGBW)分布,以评估平衡状态下颗粒产生的分布。分析了ALICE合作组的$\sqrt{s}=2.76$ TeV的$PbPb$碰撞数据,计算了π介子产生的核修正因子.

英文摘要:

The transverse momentum spectra of hadrons is calculated from the unintegrated gluon distribution (UGD) within the $k_T$-factorization framework at small $x$. Starting from $pp$ collisions, the modification caused by the nuclear medium is incorporated in the UGD at high energies, which is related to the nuclear shadowing phenomenon. Moreover, we consider that particle production from minijet decaying is not enough to explain the $p_T$ spectra in $AA$ collisions due to collective phenomena that take place after the hard collision. The Boltzmann-Gibbs Blast Wave (BGBW) distribution is utilized in order to evaluate the distribution of particle production in equilibrium. Data from ALICE collaboration for $PbPb$ collisions at $\sqrt{s}=2.76$ TeV are analyzed and the nuclear modification factor for pion production is computed.

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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