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arXiv · 1102.5614

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

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

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 $dN_{ch}/d\eta=1584 \pm 80$ 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.

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Xiao-Fang Chen, Tetsufumi Hirano, Enke Wang, Xin-Nian Wang, Hanzhong Zhang. 2011-02-28. Suppression of high $p_{T}$ hadrons in $Pb+Pb$ Collisions at LHC. https://doi.org/10.1103/physrevc.84.034902

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