Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton–lead collisions at √sNN =5.02 TeV with the ATLAS detector

Allison, Lee and Barton, Adam Edward and Borissov, Guennadi and Bouhova-Thacker, Evelina Vassileva and Chilingarov, Alexandre and Dearnaley, William and Fox, Harald and Grimm, Kathryn Ann Tschann and Henderson, Robert Charles William and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin Eamonn and Love, Peter Allan and Maddocks, Harvey and Smizanska, Maria and Walder, James William (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. European Physical Journal C: Particles and Fields, 76. ISSN 1434-6044

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Abstract

The 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.

Item Type: Journal Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2200/2201
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 79505
Deposited By: ep_importer_pure
Deposited On: 13 May 2016 13:40
Refereed?: Yes
Published?: Published
Last Modified: 23 Oct 2019 05:37
URI: https://eprints.lancs.ac.uk/id/eprint/79505

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