Event-by-event correlations between $\mathrm{\ensuremath{\Lambda}} (\overline{\mathrm{\ensuremath{\Lambda}}})$ hyperon global polarization and handedness with charged hadron azimuthal separation in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=27$ GeV from STAR

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dc.citation.articleNumber014909en_US
dc.citation.issueNumber1en_US
dc.citation.journalTitlePhysical Review Cen_US
dc.citation.volumeNumber108en_US
dc.contributor.authorSTAR Collaborationen_US
dc.date.accessioned2024-05-03T15:51:03Zen_US
dc.date.available2024-05-03T15:51:03Zen_US
dc.date.issued2023en_US
dc.description.abstractGlobal polarizations (P) of Λ (¯¯¯Λ) hyperons have been observed in noncentral heavy-ion collisions. The strong magnetic field primarily created by the spectator protons in such collisions would split the Λ and ¯¯¯Λ global polarizations (ΔP=PΛ−P¯¯¯Λ<0). Additionally, quantum chromodynamics predicts topological charge fluctuations in vacuum, resulting in a chirality imbalance or parity violation in a local domain. This would give rise to an imbalance (Δn=NL−NR⟨NL+NR⟩≠0) between left- and right-handed Λ (¯¯¯Λ) as well as a charge separation along the magnetic field, referred to as the chiral magnetic effect (CME). This charge separation can be characterized by the parity-even azimuthal correlator (Δγ) and parity-odd azimuthal harmonic observable (Δa1). Measurements of ΔP, Δγ, and Δa1 have not led to definitive conclusions concerning the CME or the magnetic field, and Δn has not been measured previously. Correlations among these observables may reveal new insights. This paper reports measurements of correlation between Δn and Δa1, which is sensitive to chirality fluctuations, and correlation between ΔP and Δγ sensitive to magnetic field in Au+Au collisions at 27 GeV. For both measurements, no correlations have been observed beyond statistical fluctuations.en_US
dc.identifier.citationSTAR Collaboration. (2023). Event-by-event correlations between $\mathrm{\ensuremath{\Lambda}} (\overline{\mathrm{\ensuremath{\Lambda}}})$ hyperon global polarization and handedness with charged hadron azimuthal separation in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=27$ GeV from STAR. Physical Review C, 108(1), 014909. https://doi.org/10.1103/PhysRevC.108.014909en_US
dc.identifier.digitalPhysRevC108014909en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevC.108.014909en_US
dc.identifier.urihttps://hdl.handle.net/1911/115519en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsThis work is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleEvent-by-event correlations between $\mathrm{\ensuremath{\Lambda}} (\overline{\mathrm{\ensuremath{\Lambda}}})$ hyperon global polarization and handedness with charged hadron azimuthal separation in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=27$ GeV from STARen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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