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Nuclear modification factor $R_{AA}(p_{T})$ for large transverse momentumpion spectra in $Pb+Pb$ collisions at $\sqrt{s}=2.76$ TeV is predicted withinthe NLO perturbative QCD parton model. Effect of jet quenching is incorporatedthrough medium modified fragmentation functions within the higher-twistapproach. The jet transport parameter that controls medium modification isproportional to the initial parton density and the coefficient is fixed by theRHIC data on suppression of large $p_{T}$ hadron spectra. Data on chargedhadron multiplicity $dN_{ch}/d\eta=1584 \pm 80$ in central $Pb+Pb$ collisionsfrom the ALICE Experiment at the LHC are used to constrain the initial partondensity both for determining the jet transport parameter and the 3+1D idealhydrodynamic evolution of the bulk matter that is employed for the calculationof $R_{PbPb}(p_{T})$ for neutral pions.

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