Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton-lead collisions at √<i>s</i><sub>NN</sub>=5.02 TeV with the ATLAS detector



Aad, G, Abajyan, T, Abbott, B, Abdallah, J, Khalek, S Abdel, Abdinov, O, Aben, R, Abi, B, Abolins, M, AbouZeid, OS
et al (show 2833 more authors) (2016) Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton-lead collisions at √<i>s</i><sub>NN</sub>=5.02 TeV with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 76 (4). 199-.

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Abstract

The centrality dependence of the mean charged-particle multiplicity as a function of pseudorapidity is measured in approximately 1 [Formula: see text]b[Formula: see text] of proton-lead collisions at a nucleon-nucleon centre-of-mass energy of [Formula: see text] [Formula: see text] 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 [Formula: see text] 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 [Formula: see text] 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 [Formula: see text] collisions.

Item Type: Article
Additional Information: 28 pages plus author list + cover pages (46 pages total), 14 figures, 4 tables, submitted to EPJC, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2012-15/
Uncontrolled Keywords: ATLAS Collaboration
Depositing User: Symplectic Admin
Date Deposited: 14 Mar 2017 14:47
Last Modified: 11 Oct 2023 17:00
DOI: 10.1140/epjc/s10052-016-4002-3
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006385