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

STAR Collaboration

doi:10.1103/PhysRevC.108.014909

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

STAR Collaboration

Chemistry

American University in Cairo
Texas A&M University
Czech Technical University in Prague
Ohio State University
Joint Institute for Nuclear Research
Panjab University
Variable Energy Cyclotron Centre India
Russian Research Centre Kurchatov Institute
Moscow Engineering Physics Institute
Indian Institute of Technology Patna
Abilene Christian University
Universidad de Tarapacá
University of California at Riverside
University of Houston
University of Jammu
Stony Brook University
Chinese Academy of Sciences
Yale University
University of California at Davis
Lawrence Berkeley National Laboratory
University of California at Los Angeles
Indiana University Bloomington
National Institute of Technology, Durgapur
Shandong University
Fudan University
Tsinghua University
Brookhaven National Laboratory
University of California at Berkeley
University of Illinois at Chicago

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Global 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-PΛ¯<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.

Original language	English
Article number	014909
Journal	Physical Review C
Volume	108
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.108.014909
State	Published - Jul 2023

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10.1103/PhysRevC.108.014909

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@article{b2ab7e55b70f4e98840c798f5826a2a5,

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

abstract = "Global 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-PΛ¯<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.",

author = "\{STAR Collaboration\} and Abdulhamid, \{M. I.\} and Aboona, \{B. E.\} and J. Adam and Adams, \{J. R.\} and G. Agakishiev and I. Aggarwal and Aggarwal, \{M. M.\} and Z. Ahammed and A. Aitbaev and I. Alekseev and Anderson, \{D. M.\} and A. Aparin and S. Aslam and J. Atchison and Averichev, \{G. S.\} and V. Bairathi and W. Baker and \{Ball Cap\}, \{J. G.\} and K. Barish and P. Bhagat and A. Bhasin and S. Bhatta and Bordyuzhin, \{I. G.\} and Brandenburg, \{J. D.\} and Brandin, \{A. V.\} and Cai, \{X. Z.\} and H. Caines and \{De La Barca S{\'a}nchez\}, \{M. Calder{\'o}n\} and D. Cebra and J. Ceska and I. Chakaberia and Chan, \{B. K.\} and Z. Chang and A. Chatterjee and D. Chen and J. Chen and Chen, \{J. H.\} and Z. Chen and J. Cheng and Y. Cheng and S. Choudhury and W. Christie and X. Chu and Crawford, \{H. J.\} and G. Dale-Gau and A. Das and M. Daugherity and Dedovich, \{T. G.\} and J. Jia and R. Lacey",

note = "Publisher Copyright: {\textcopyright} 2023 American Physical Society.",

year = "2023",

month = jul,

doi = "10.1103/PhysRevC.108.014909",

language = "English",

volume = "108",

journal = "Physical Review C",

issn = "2469-9985",

number = "1",

}

TY - JOUR

T1 - Event-by-event correlations between Λ (Λ¯) hyperon global polarization and handedness with charged hadron azimuthal separation in Au+Au collisions at sNN =27 GeV from STAR

AU - STAR Collaboration

AU - Abdulhamid, M. I.

AU - Aboona, B. E.

AU - Adam, J.

AU - Adams, J. R.

AU - Agakishiev, G.

AU - Aggarwal, I.

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Aitbaev, A.

AU - Alekseev, I.

AU - Anderson, D. M.

AU - Aparin, A.

AU - Aslam, S.

AU - Atchison, J.

AU - Averichev, G. S.

AU - Bairathi, V.

AU - Baker, W.

AU - Ball Cap, J. G.

AU - Barish, K.

AU - Bhagat, P.

AU - Bhasin, A.

AU - Bhatta, S.

AU - Bordyuzhin, I. G.

AU - Brandenburg, J. D.

AU - Brandin, A. V.

AU - Cai, X. Z.

AU - Caines, H.

AU - De La Barca Sánchez, M. Calderón

AU - Cebra, D.

AU - Ceska, J.

AU - Chakaberia, I.

AU - Chan, B. K.

AU - Chang, Z.

AU - Chatterjee, A.

AU - Chen, D.

AU - Chen, J.

AU - Chen, J. H.

AU - Chen, Z.

AU - Cheng, J.

AU - Cheng, Y.

AU - Choudhury, S.

AU - Christie, W.

AU - Chu, X.

AU - Crawford, H. J.

AU - Dale-Gau, G.

AU - Das, A.

AU - Daugherity, M.

AU - Dedovich, T. G.

AU - Jia, J.

AU - Lacey, R.

PY - 2023/7

Y1 - 2023/7

N2 - Global 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-PΛ¯<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.

AB - Global 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-PΛ¯<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.

UR - https://www.scopus.com/pages/publications/85169100229

U2 - 10.1103/PhysRevC.108.014909

DO - 10.1103/PhysRevC.108.014909

M3 - Article

AN - SCOPUS:85169100229

SN - 2469-9985

VL - 108

JO - Physical Review C

JF - Physical Review C

IS - 1

M1 - 014909

ER -

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

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