y Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton-lead collisions at √sNN=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) y Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton-lead collisions at √sNN=5.02 TeV with the ATLAS detector EUROPEAN PHYSICAL JOURNAL C, 76 (4). 199-. ISSN 1434-6044, 1434-6052

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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 presented.) b (Formula presented.) of proton–lead collisions at a nucleon–nucleon centre-of-mass energy of (Formula presented.)   (Formula presented.) 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.

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: 24 Jun 2026 20:53
DOI: 10.1140/epjc/s10052-016-4002-3
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006385
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