Scaling Properties of the $Δγ$ Correlator: Constraints on Background and CME-Sensitive Charge Separation in Heavy-Ion Collisions

[2206.05773] Scaling Properties of the $Δγ$ Correlator: Constraints on Background and CME-Sensitive Charge Separation in Heavy-Ion Collisions Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Nuclear Experiment arXiv:2206.05773 (nucl-ex) [Submitted on 12 Jun 2022 ( v1 ), last revised 15 Aug 2026 (this version, v4)] Title: Scaling Properties of the $Δγ$ Correlator: Constraints on Background and CME-Sensitive Charge Separation in Heavy-Ion Collisions Authors: Roy A. Lacey (1), Niseem Magdy (2) ((1) Depts. of Chemistry and Physics, Stony Brook University, Stony Brook, New York 11794, USA (2) Dept. of Physics, Texas Southern University, Houston, TX 77004, USA) View a PDF of the paper titled Scaling Properties of the $\Delta\gamma$ Correlator: Constraints on Background and CME-Sensitive Charge Separation in Heavy-Ion Collisions, by Roy A. Lacey (1) and Niseem Magdy (2) ((1) Depts. of Chemistry and Physics and 8 other authors View PDF HTML (experimental) Abstract: The scaling properties of the $\Delta\gamma$ correlator are used to investigate charge separation associated with the chiral magnetic effect (CME) in $p$+Au, $d$+Au, Ru+Ru, Zr+Zr, and Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$~GeV, and in $p$+Pb and Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ and $2.76$~TeV. Anomalous Viscous Fluid Dynamics (AVFD) calculations provide complementary benchmarks for background and signal+background behavior. Scaling $\Delta\gamma$ by the elliptic-flow coefficient $v_2$ reduces the leading flow-coupled background dependence, while the resulting $\Delta\gamma/v_2$ exhibits a common approximate $1/N_{\rm ch}$ scaling behavior for $p$+Au, $d$+Au, $p$+Pb, and Pb+Pb collisions, consistent with multiplicity dilution of background-driven charge correlations across markedly different collision systems and environments. In contrast, Ru+Ru, Zr+Zr, and Au+Au collisions exhibit systematic positive deviations from their respective $1/N_{\rm ch}$ background-scaling trends. These scaling violations are qualitatively similar to those generated by AVFD calculations with an input CME signal and, relative to the experimentally constrained background scaling, provide evidence for a CME contribution to the measured charge separation. The inferred CME fraction is approximately $27\%$ for mid-central Au+Au collisions and roughly a factor of two smaller for Ru+Ru and Zr+Zr, whose values are consistent within uncertainties. The inferred CME fractions reduce the expected Ru+Ru--Zr+Zr difference to only $\sim1.3\%$ in the total charge-separation signal, explaining its limited experimental sensitivity. These results demonstrate that scaling violations relative to an experimentally constrained background provide a quantitative strategy for isolating a CME contribution to charge separation in heavy-ion collisions. Comments: 5 figures, published version. arXiv admin note: text overlap with arXiv:2203.10029 Subjects: Nuclear Experiment (nucl-ex) ; High Energy Physics - Experiment (hep-ex); Nuclear Theory (nucl-th) Cite as: arXiv:2206.05773 [nucl-ex] (or arXiv:2206.05773v4 [nucl-ex] for this version) https://doi.org/10.48550/arXiv.2206.05773 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Roy Lacey [ view email ] [v1] Sun, 12 Jun 2022 15:40:38 UTC (159 KB) [v2] Tue, 21 Jun 2022 22:05:22 UTC (159 KB) [v3] Fri, 19 Jun 2026 17:57:10 UTC (159 KB) [v4] Sat, 15 Aug 2026 09:32:06 UTC (159 KB) Full-text links: Access Paper: View a PDF of the paper titled Scaling Properties of the $\Delta\gamma$ Correlator: Constraints on Background and CME-Sensitive Charge Separation in Heavy-Ion Collisions, by Roy A. Lacey (1) and Niseem Magdy (2) ((1) Depts. of Chemistry and Physics and 8 other authors View PDF HTML (experimental) TeX Source view license Current browse context: nucl-ex < prev | next > new | recent | 2022-06 Change to browse by: hep-ex nucl-th References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... 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