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arXiv 1102.5614nucl-thhep-phnucl-ex
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LHC上$Pb+Pb$碰撞中高$p_{T}$强子的抑制

Suppression of high $p_{T}$ hadrons in $Pb+Pb$ Collisions at LHC

Xiao-Fang Chen, Tetsufumi Hirano, Enke Wang, Xin-Nian Wang, Hanzhong Zhang

摘要:

在非线性光学微扰QCD部分子模型下,计算了$\sqrt{s}=2.76$ TeV的$Pb+Pb$碰撞中大横动量π介子谱的核修正因子$R_{AA}(p_{T})$.射流淬火的影响是通过在高扭转方法中的介质修改的碎裂功能。控制介质修正的喷流输运参数与初始部分子密度成正比,该系数由RHIC对大$p_{T}$强子谱的抑制数据确定。利用LHC ALICE实验中的中心$Pb+Pb$碰撞中的带电强子多重数$dN_{ch}/dη=1584 \pm 80$数据来约束初始部分子密度,以确定喷流输运参数和用于计算中性π介子$R_{PbPb}(p_{T})$的大块物质的3+ 1维理想流体动力学演化.

英文摘要:

Nuclear modification factor $R_{AA}(p_{T})$ for large transverse momentum pion spectra in $Pb+Pb$ collisions at $\sqrt{s}=2.76$ TeV is predicted within the NLO perturbative QCD parton model. Effect of jet quenching is incorporated through medium modified fragmentation functions within the higher-twist approach. The jet transport parameter that controls medium modification is proportional to the initial parton density and the coefficient is fixed by the RHIC data on suppression of large $p_{T}$ hadron spectra. Data on charged hadron multiplicity $dN_{ch}/dη=1584 \pm 80$ in central $Pb+Pb$ collisions from the ALICE Experiment at the LHC are used to constrain the initial parton density both for determining the jet transport parameter and the 3+1D ideal hydrodynamic evolution of the bulk matter that is employed for the calculation of $R_{PbPb}(p_{T})$ for neutral pions.

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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