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

Measurements of charged hadron spectra and the nuclear modification factor in Pb+Pb collisions at $\sqrt{s_{NN}}=5.02$TeV with the ATLAS detector at the LHC are presented. The measurements are performed using data with an integrated luminosity of 0.49nb${}^{-1}$ in Pb+Pb collisions and 25pb${}^{-1}$ in pp collisions, obtained in the 2015 LHC physics run. Charged hadron Pb+Pb spectra measured in several centrality intervals are divided by pp spectrum to form the nuclear modification factor, $R_\mathrm{AA}$, which provides insight into the effects of jet quenching in nuclear collisions. The behavior of $R_\mathrm{AA}$ is studied as a function of transverse momentum up to 300GeV in different centralities. The values of $R_\mathrm{AA}$ measured at $\sqrt{s_{NN}}=5.02$TeV are found to be consistent with the previous measurements at $\sqrt{s_{NN}}=2.76$TeV published by the ATLAS experiment.