Relative particle yield fluctuations in Pb-Pb collisions at √sNN=2.76 TeV

Acharya, S. and Antičić, Tome and Erhardt, Filip and Gotovac, Sven and Jerčić, Marko and Lončar, Petra and Mudnić, Eugen and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Utrobičić, Antonija and Vicković, Linda and Zou, S. (ALICE Collaboration) (2019) Relative particle yield fluctuations in Pb-Pb collisions at √sNN=2.76 TeV. European Physical Journal C, 79 (3). pp. 236-14. ISSN 1434-6044

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First results on K/π , p/π and K/p fluctuations are obtained with the ALICE detector at the CERN LHC as a function of centrality in Pb--Pb collisions at √sNN=2.76 TeV . The observable νdyn , which is defined in terms of the moments of particle multiplicity distributions, is used to quantify the magnitude of dynamical fluctuations of relative particle yields and also provides insight into the correlation between particle pairs. This study is based on a novel experimental technique, called the Identity Method, which allows one to measure the moments of multiplicity distributions in case of incomplete particle identification. The results for p/π show a change of sign in νdyn from positive to negative towards more peripheral collisions. For central collisions, the results follow the smooth trend of the data at lower energies and νdyn exhibits a change in sign for p/π and K/p.

Item Type: Article
Keywords: particle: yield, heavy ion: scattering, p: fluctuation, particle: multiplicity, yield: fluctuation, particle identification, impact parameter, CERN LHC Coll, experimental results, correlation, peripheral, quark gluon: plasma, multiplicity: ratio
Date: 2019
Number of Pages: 19
Subjects: NATURAL SCIENCES > Physics
Additional Information: © CERN for the benefit of the ALICE collaboration 2019. Received: 11 January 2018; Accepted: 24 February 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, 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.
Divisions: Faculty of Science > Department of Physics
Publisher: Springer
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 28 Mar 2019 13:57
Last Modified: 28 Mar 2019 13:57

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