Event-by-event correlations between Λ (¯Λ) hyperon global polarization and handedness with charged hadron azimuthal separation in Au + Au collisions at √s NN = 27 GeV from STAR

• Titel: Event-by-event correlations between Λ (¯Λ) hyperon global polarization and handedness with charged hadron azimuthal separation in Au + Au collisions at √s NN = 27 GeV from STAR
• Mitwirkende: Abdulhamid, Muhammad Ibrahim [VerfasserIn]
• Mitwirkende: Deppner, Ingo Martin [VerfasserIn]
• Mitwirkende: Leung, Yue [VerfasserIn]
• Mitwirkende: Söhngen, Yannick [VerfasserIn]
• Mitwirkende: Weidenkaff, Philipp [VerfasserIn]
• Körperschaft: STAR Collaboration [VerfasserIn]
• Verf.angabe: (STAR Collaboration)
• E-Jahr: 2023
• Jahr: July 2023
• Umfang: 11 S.
• Fussnoten: Online verfügbar: 21. Juli 2023 ; 4201 Im Titel steht "sNN" unter dem Wurzelsymbol, NN ist dabei tiefgestellt ; STAR Collaboration: M.I. Abdulhamid, I.M. Deppner, Y.H. Leung, Y. Söhngen, P.C. Weidenkaff [und 352 weitere] ; Gesehen am 08.05.2025
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2023
• Band/Heft Quelle: 108(2023), 1, Artikel-ID 014909, Seite 014909-1-014909-11
• ISSN Quelle: 2469-9993
• DOI: doi:10.1103/PhysRevC.108.014909
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 192507661X

Abstract

Global polarizations () of 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 and global polarizations (). 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 () between left- and right-handed () 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 () and parity-odd azimuthal harmonic observable (). Measurements of , and have not led to definitive conclusions concerning the CME or the magnetic field, and has not been measured previously. Correlations among these observables may reveal new insights. This paper reports measurements of correlation between and , which is sensitive to chirality fluctuations, and correlation between and sensitive to magnetic field in collisions at 27 GeV. For both measurements, no correlations have been observed beyond statistical fluctuations.