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Charged-particle spectra obtained in 0.15 nb${}^{-1}$ of Pb+Pb interactionsat $\sqrt{{s}_\mathsf{{NN}}}=2.76$TeV and 4.2 pb${}^{-1}$ of pp interactions at$\sqrt{s}=2.76$ TeV with the ATLAS detector at the LHC are presented in a widetransverse momentum ($0.5 < p_{\mathrm{T}} < 150$ GeV) and pseudorapidity($|\eta|<2$) range. For Pb+Pb collisions, the spectra are presented as afunction of collision centrality, which is determined by the response of theforward calorimeter located on both sides of the interaction point. The nuclearmodification factors $R_{\mathrm{AA}}$ and $R_{\mathrm{CP}}$ are presented indetail as function of centrality, $p_{\mathrm{T}}$ and $\eta$. They show adistinct $p_{\mathrm{T}}$-dependence with a pronounced minimum at about 7 GeV.Above 60 GeV, $R_{\mathrm{AA}}$ is consistent with a plateau at acentrality-dependent value, within the uncertainties. The value is$0.55\pm0.01(stat.)\pm0.04(syst.)$ in the most central collisions. The$R_{\mathrm{AA}}$ distribution is consistent with flat $|\eta|$ dependence overthe whole transverse momentum range in all centrality classes.

Measurement of charged-particle spectra in Pb+Pb collisions at $\sqrt{{s}_\mathsf{{NN}}} = 2.76$ TeV with the ATLAS detector at the LHC