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


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Acharya S., Adamová D., Aglieri Rinella G., Agnello M., Agrawal N., Ahammed Z., ...More

Journal of High Energy Physics, vol.2023, no.12, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 2023 Issue: 12
  • Publication Date: 2023
  • Doi Number: 10.1007/jhep12(2023)067
  • Journal Name: Journal of High Energy Physics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, INSPEC, zbMATH, Directory of Open Access Journals
  • Keywords: Collective Flow, Heavy Ion Experiments, Quark Deconfinement
  • Yıldız Technical University Affiliated: Yes

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 r3Norm is found to be larger than zero and to have a magnitude similar to r2Norm, thus pointing to a large background contribution for these measurements. Furthermore, r2Norm 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.