# QM 2011 - XXII International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

May 22 – 28, 2011
Centre Bonlieu
Europe/Zurich timezone

## Suppression of high p_T hadrons in PbPb Collisions at LHC

May 26, 2011, 4:00 PM
20m
Salle de l'Europe (Centre Bonlieu)

France
Parallel Jets

### Speaker

Prof. Hanzhong Zhang (IOPP)

### Description

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

### Primary author

Dr Xin-Nian Wang (IOPP / LBNL)

### Co-authors

Prof. Enke Wang (IOPP) Prof. Hanzhong Zhang (IOPP) Prof. Tetsufumi Hirano (Tokyo University) Dr Xiao-fang Chen (IOPP)

### Presentation materials

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