Probing the chiral magnetic wave with charge-dependent flow measurements in Pb-Pb collisions at the LHC



Acharya, S, Adamova, D, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I, Akindinov, A
et al (show 1044 more authors) (2023) Probing the chiral magnetic wave with charge-dependent flow measurements in Pb-Pb collisions at the LHC JOURNAL OF HIGH ENERGY PHYSICS, 2023 (12). 67-. ISSN 1126-6708, 1029-8479

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Abstract

The Chiral Magnetic Wave (CMW) phenomenon is essential to provide insights into the strong interaction in QCD, the properties of the quark-gluon plasma, and the topological characteristics of the early universe, offering a deeper understanding of fundamental physics in high-energy collisions. Measurements of the charge-dependent anisotropic flow coefficients are studied in Pb-Pb collisions at center-of-mass energy per nucleon-nucleon collision s<inf>NN</inf> = 5.02 TeV to probe the CMW. In particular, the slope of the normalized difference in elliptic (v<inf>2</inf>) and triangular (v<inf>3</inf>) flow coefficients of positively and negatively charged particles as a function of their event-wise normalized number difference, is reported for inclusive and identified particles. The slope r<inf>3</inf>Norm is found to be larger than zero and to have a magnitude similar to r<inf>2</inf>Norm, thus pointing to a large background contribution for these measurements. Furthermore, r<inf>2</inf>Norm can be described by a blast wave model calculation that incorporates local charge conservation. In addition, using the event shape engineering technique yields a fraction of CMW (f<inf>CMW</inf>) contribution to this measurement which is compatible with zero. This measurement provides the very first upper limit for f<inf>CMW</inf>, and in the 10–60% centrality interval it is found to be 26% (38%) at 95% (99.7%) confidence level.

Item Type: Article
Uncontrolled Keywords: Collective Flow, Heavy Ion Experiments, Quark Deconfinement
Depositing User: Symplectic Admin
Date Deposited: 13 Aug 2024 14:45
Last Modified: 16 Jun 2026 20:28
DOI: 10.1007/JHEP12(2023)067
Open Access URL: https://doi.org/10.1007/JHEP12(2023)067
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3183695
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