A1 Journal article (refereed)
Probing the chiral magnetic wave with charge-dependent flow measurements in Pb-Pb collisions at the LHC (2023)

The ALICE collaboration. (2023). Probing the chiral magnetic wave with charge-dependent flow measurements in Pb-Pb collisions at the LHC. Journal of High Energy Physics, 2023, Article 67. https://doi.org/10.1007/JHEP12(2023)067

JYU authors or editors

Publication details

All authors or editors: The ALICE collaboration

Journal or series: Journal of High Energy Physics

ISSN: 1126-6708

eISSN: 1029-8479

Publication year: 2023

Publication date: 12/12/2023

Volume: 2023

Article number: 67

Publisher: Springer Nature

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1007/JHEP12(2023)067

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/98382

Web address of parallel published publication (pre-print):  https://doi.org/10.48550/arXiv.2308.16123

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 √sNN= 5.02 TeV to probe the CMW. In particular, the slope of the normalized difference in elliptic (v2) and triangular (v3) 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 rNorm3 is found to be larger than zero and to have a magnitude similar to rNorm2, thus pointing to a large background contribution for these measurements. Furthermore, rNorm2 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 (fCMW) contribution to this measurement which is compatible with zero. This measurement provides the very first upper limit for fCMW, and in the 10-60% centrality interval it is found to be 26% (38%) at 95% (99.7%) confidence level.

Keywords: particle physics; nuclear physics

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Ministry reporting: Yes

VIRTA submission year: 2024

Preliminary JUFO rating: 3