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.

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.108.014909

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@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",

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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.

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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

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