Multiplicity and transverse momentum evolution of charge-dependent correlations in pp, p–Pb, and Pb–Pb collisions at the LHC

Adam, J. and Antičić, Tome and Erhardt, Filip and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Utrobičić, Antonija and Zyzak, M. (ALICE Collaboration) (2016) Multiplicity and transverse momentum evolution of charge-dependent correlations in pp, p–Pb, and Pb–Pb collisions at the LHC. European Physical Journal C, 76 (2). pp. 86-24. ISSN 1434-6044

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Abstract

We report on two-particle charge-dependent correlations in pp, p–Pb, and Pb–Pb collisions as a function of the pseudorapidity and azimuthal angle difference, η and ϕ respectively. These correlations are studied using the balance function that probes the charge creation time and the development of collectivity in the produced system. The dependence of the balance function on the event multiplicity as well as on the trigger and associated particle transverse momentum (pT) in pp, p–Pb, and Pb–Pb collisions at √sNN = 7, 5.02, and 2.76 TeV, respectively, are presented. In the low transverse momentum region, for 0.2 < pT < 2.0 GeV/c, the balance function becomes narrower in both η and ϕ directions in all three systems for events with higher multiplicity. The experimental findings favor models that either incorporate some collective behavior (e.g. AMPT) or different mechanisms that lead to effects that resemble collective behavior (e.g. PYTHIA8 with color reconnection). For higher values of transverse momenta the balance function becomes even narrower but exhibits no multiplicity dependence, indicating that the observed narrowing with increasing multiplicity at low pT is a feature of bulk particle production. 1

Item Type: Article
Date: February 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: © CERN for the benefit of the ALICE collaboration 2016. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP3. Received: 5 October 2015. Accepted: 29 January 2016. Published online: 19 February 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: Springer
Depositing User: Nikola Poljak
Date Deposited: 27 May 2016 10:50
Last Modified: 27 May 2016 10:50
URI: http://digre.pmf.unizg.hr/id/eprint/4858

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