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Measurements of the per-event charged-particle yield as a function of thecharged-particle transverse momentum and rapidity are performed using $p+$Pbcollision data collected by the ATLAS experiment at the LHC at a centre-of-massenergy of $\sqrt{s_{NN}}=5.02$ TeV. Charged particles are reconstructed overpseudorapidity $|\eta|<2.3$ and transverse momentum between $0.1$ GeV and $22$GeV in a dataset corresponding to an integrated luminosity of $1$ $\mu b^{-1}$.The results are presented in the form of charged-particle nuclear modificationfactors, where the $p+$Pb charged-particle multiplicities are compared betweencentral and peripheral $p+$Pb collisions as well as to charged-particle crosssections measured in pp collisions. The $p+$Pb collision centrality ischaracterized by the total transverse energy measured in $-4.9<\eta<-3.1$,which is in the direction of the outgoing lead beam. Three differentestimations of the number of nucleons participating in the $p+$Pb collision arecarried out using the Glauber model and two Glauber-Gribov colour-fluctuationextensions to the Glauber model. The values of the nuclear modification factorsare found to vary significantly as a function of rapidity and transversemomentum. A broad peak is observed for all centralities and rapidities in thenuclear modification factors for charged-particle transverse momentum valuesaround $3$ GeV. The magnitude of the peak increases for more central collisionsas well as rapidity ranges closer to the direction of the outgoing leadnucleus.

physics letters b

Transverse momentum, rapidity, and centrality dependence of inclusive  charged-particle production in $\sqrt{s_{NN}}=5.02$ TeV p+Pb collisions  measured by the ATLAS experiment