by the ALICE experiment at the LHC. The $p_T$ spectra are compared to NLO calculations. Though the cross section for an individual $\sqrt{s}$ cannot

be described by NLO-pQCD, the relative increase of cross section with $\sqrt{s}$ is well described by NLO. Based on these measurements and observations,

procedures are discussed to construct $pp$ reference spectra at $\sqrt{s} =$ 2.76 and 5.023 TeV up to high $p_T$ as required for the calculation of

the nuclear modification factor $R_{AA}$ in nucleus-nucleus resp. proton-nucleus collisions.