Measurement of nuclear modification factor $R_{\rm{AA}}$ in Pb+Pb collisions at $\sqrt{s_{_{\rm{NN}}}}=5.02TeV$ with the ATLAS detector at the LHC

This poster presents inclusive charged hadron spectra measured in Pb+Pb collisions at $\sqrt{s_{_{\rm{NN}}}}=5.02$TeV with the ATLAS detector at the LHC. The measurements are performed with data recorded in 2015 with the integrated luminosity of 0.49nb$^{−1}$. Spectra measured in centrality intervals is compared to the pp data with integrated luminosity of 25pb$^{−1}$ obtained the same year to form the nuclear modification factor, RAA. Its behavior is studied as a function of the systems size and as a function of the hadron transverse momentum, pT, up to 300GeV. The $R_{\rm{AA}}$ measured at $\sqrt{s_{_{\rm{NN}}}}=5.02$TeV in general is found to be consistent with the previous measurement published by the ATLAS experiment. Above 60GeV, $R_{\rm{AA}}$ is consistent with a plateau at a centrality-dependent value, within the uncertainties.