Measurement of charged particle spectra in pp collisions and nuclear modification factor $R_\mathrm{pPb}$ at $\sqrt{s_{NN}}=5.02$TeV with the ATLAS detector at the LHC

This note presents an analysis of the inclusive charged particle spectra in pp collisions at $\sqrt{s}=5.02$TeV that are measured with the ATLAS experiment at the LHC. The measurements are performed with pp data recorded in 2015 with an integrated luminosity of 25pb$^{-1}$. The ratio of spectra measured in the p+Pb collisions to the pp cross section scaled by the number of binary nucleon-nucleon collisions, $R_\mathrm{pPb}$, is evaluated to facilitate a comparison of the particle production in the two colliding systems. The nuclear modification factor does not show any significant deviation from unity in the probed transverse momentum region.