Measurements of charged particle spectra and nuclear modification factor in p+Pb collisions with the ATLAS detector

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The ATLAS detector at the LHC obtained the sample of p+Pb data at √sNN=5.02TeV with integrated luminosity of 25nb⁻¹, which can be compared to the pp data obtained by interpolating pp measurements at √s=2.76TeV and 7TeV. Due to the excellent capabilities of the ATLAS detector, and its stable operation in heavy ion as well as proton-proton physics runs, the data allow measurements of the nuclear modification factor, ratio of heavy ion charged particle spectra divided by pp reference, in different centrality classes over a wide range of rapidity. The charged particle nuclear modification factor is found to vary significantly as a function of transverse momentum with a stronger dependence in more peripheral collisions.