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The measurement of charged particle spectra in heavy ion collisions is a wayto study properties of hot and dense matter created in these interactions. Thecentrality dependence of the spectral shape is an important tool to understandthe energy loss mechanism. The ATLAS detector at the LHC accumulated integratedluminosity equal to 0.15nb^{-1} of lead-lead data at 2.76TeV pernucleon-nucleon pair. Due to the excellent capabilities of the ATLAS detector,and its stable operation in 2010 and 2011 heavy ion physics runs, these dataallow measurements of the charged particle spectra and their ratios indifferent centrality bins over a wide range of transverse momenta (0.5-150GeV)and pseudorapidity (|eta|<2.5). The measured ratio central to peripheral eventsshows a suppresion by a factor of 5 at pT=7GeV. At higher pT the ratioincreases.

Spectra and nuclear modification factor of charged hadrons produced in lead-lead collisions at sqrt(s_NN)=2.76TeV with the ATLAS detector at the LHC