Transverse momentum, rapidity, and centrality dependence of inclusive charged-particle production in √sNN=5.02 TeV p + Pb collisions measured by the ATLAS experiment

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Transverse momentum, rapidity, and centrality dependence of inclusive charged-particle production in √sNN=5.02 TeV p + Pb collisions measured by the ATLAS experiment. Physics letters. B, 763, pp. 313-336. Elsevier 10.1016/j.physletb.2016.10.053

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Measurements of the per-event charged-particle yield as a function of the charged-particle transverse momentum and rapidity are performed using p+ Pb collision data collected by the ATLAS experiment at the LHC at a centre-of-mass energy of √sNN=5.02 TeV. Charged particles are reconstructed over pseudorapidity |η|< 2.3 and transverse momentum between 0.1 GeV and 22 GeV in a dataset corresponding to an integrated luminosity of 1 μb⁻¹. The results are presented in the form of charged-particle nuclear modification factors, where the p+ Pb charged-particle multiplicities are compared between central and peripheral p+ Pb collisions as well as to charged-particle cross sections measured in pp collisions. The p+ Pb collision centrality is characterized by the total transverse energy measured in −4.9 < η < −3.1 , which is in the direction of the outgoing lead beam. Three different estimations of the number of nucleons participating in the p+ Pb collision are carried out using the Glauber model and two Glauber-Gribov colour-fluctuation extensions to the Glauber model. The values of the nuclear modification factors are found to vary significantly as a function of rapidity and transverse momentum. A broad peak is observed for all centralities and rapidities in the nuclear modification factors for charged-particle transverse momentum values around 3 GeV. The magnitude of the peak increases for more central collisions as well as rapidity ranges closer to the direction of the outgoing lead nucleus.

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