Suppression of high $p_T$ hadrons in $Pb+Pb$ Collisions at LHC

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

7 pages in RevTex, 3 figures (some typos corrected)

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