Charged hadron production in $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV measured at high transverse momentum by the ATLAS experiment

A measurement of the charged hadron production in $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}} =5.02$ TeV in the transverse momentum range from 4 GeV to 189 GeV is presented. The results use a data sample with an integrated luminosity of of 25 n${m b}^{-1}$ collected by the ATLAS experiment at the LHC during 2013. The results extend previous measurements by the ATLAS collaboration. The $p$+Pb collisions are analysed in centrality classes determined by the total transverse energy. The $p$+Pb charged particle multiplicities are compared to charged particle production in $pp$ collisions obtained by interpolating measurements performed at $\sqrt{s} = 2.76$ TeV and 7 TeV to $\sqrt{s} = 5.02$ TeV. The charged particle nuclear modification factor is found to vary significantly as a function of transverse momentum with a stronger dependence in more peripheral collisions.