Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 76, Issue 4, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-016-4002-3
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- ANPCyT, Argentina
- YerPhI, Armenia
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- Minerva, Israel
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- ICREA Funding Source: Custom
- Direct For Mathematical & Physical Scien
- Division Of Physics [1119200, 1305037] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1410972] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/N000463/1, GRIDPP, ST/N000307/1, PP/E000444/1] Funding Source: researchfish
- STFC [ST/N000307/1, ST/N000463/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [16H06493] Funding Source: KAKEN
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The centrality dependence of the mean charged-particle multiplicity as a function of pseudorapidity is measured in approximately 1 mu b(-1) of proton-lead collisions at a nucleon-nucleon centre-of-mass energy of root s(NN) = 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.
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