Franklin, MelissaHuth, JohnLopez Mateos, DavidMercurio, KevinMorii, MasahiroSpearman, WilliamYen, AndyZevi Della Porta, G2017-06-202016ATLAS Collaboration. 2016. “Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton--lead collisions at √snn=5.02 TeV with the ATLAS detector.” The European Physical Journal C 76 (4) (April). doi:10.1140/epjc/s10052-016-4002-3.1434-6044http://nrs.harvard.edu/urn-3:HUL.InstRepos:33056190The centrality dependence of the mean charged-particle multiplicity as a function of pseudorapidity is measured in approximately 1 μb−1 of proton--lead collisions at a nucleon--nucleon centre-of-mass energy of √snn=5.02 TeV using the ATLAS detector at the Large Hadron Collider. Charged particles with absolute pseudorapidity less than 2.7 are reconstructed using the ATLAS pixel detector. The p+Pb collision centrality is characterised by the total transverse energy measured in the Pb-going direction of the forward calorimeter. The charged-particle pseudorapidity distributions are found to vary strongly with centrality, with an increasing asymmetry between the proton-going and Pb-going directions as the collisions become more central. Three different estimations of the number of nucleons participating in the p+Pb collision have been carried out using the Glauber model as well as two Glauber--Gribov inspired extensions to the Glauber model. Charged-particle multiplicities per participant pair are found to vary differently for these three models, highlighting the importance of including colour fluctuations in nucleon--nucleon collisions in the modelling of the initial state of p+Pb collisions.en-USJournal Article2017-06-2010.1140/epjc/s10052-016-4002-3