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

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

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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

Bibliographical note

Publisher Copyright:
© 2023 American Physical Society.

Funding

We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL, and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science, the U.S. National Science Foundation, National Natural Science Foundation of China, Chinese Academy of Science, the Ministry of Science and Technology of China and the Chinese Ministry of Education, the Higher Education Sprout Project by Ministry of Education at NCKU, the National Research Foundation of Korea, Czech Science Foundation and Ministry of Education, Youth and Sports of the Czech Republic, Hungarian National Research, Development and Innovation Office, New National Excellency Programme of the Hungarian Ministry of Human Capacities, Department of Atomic Energy and Department of Science and Technology of the Government of India, the National Science Centre and WUT ID-UB of Poland, the Ministry of Science, Education and Sports of the Republic of Croatia, German Bundesministerium für Bildung, Wissenschaft, Forschung and Technologie (BMBF), Helmholtz Association, Ministry of Education, Culture, Sports, Science, and Technology (MEXT) and Japan Society for the Promotion of Science (JSPS).

Funders
Department of Atomic Energy and Department of Science and Technology
Hungarian Ministry of Human Capacities
Ministry of Education at NCKU
WUT ID-UB of Poland
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China
National Science Foundation Office of International Science and Engineering
Horia Hulubei National Institute for Physics and Nuclear Engineering
Japan Society for the Promotion of Science Fund for the Promotion of Joint International Research
Ministry of Education, Culture, Sports, Science and Technology
National Natural Science Foundation of China (NSFC)
Ministerstvo Školství, Mládeže a Tělovýchovy
Grantová Agentura České Republiky
Ministry of Education of the People's Republic of China
Bundesministerium für Bildung und Forschung
Chinese Academy of Sciences
Ministry of Science and Technology of the People's Republic of China
Ministarstvo Obrazovanja, Znanosti i Sporta
National Research Foundation of Korea
Narodowe Centrum Nauki
Max Delbrück Center for Molecular Medicine in the Helmholtz Association
Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.108.014909

Cite this

@article{aebcf1d5f83240dca42989889ca1177a,

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 = "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 Deppner, \{I. M.\} and R. Fatemi",

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

year = "2023",

month = jul,

doi = "10.1103/PhysRevC.108.014909",

language = "English",

volume = "108",

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 - 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 - Deppner, I. M.

AU - Fatemi, 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

UR - https://www.scopus.com/pages/publications/85169100229#tab=citedBy

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

Abstract

Bibliographical note

Funding

ASJC Scopus subject areas

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