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Title: A sensitivity study of the primary correlators used to characterize chiral-magnetically-driven charge separation

Abstract

A Multi-Phase Transport (AMPT) model is used to study the detection sensitivity of two of the primary correlators – Δγ and RΨ2 – employed to characterize charge separation induced by the Chiral Magnetic Effect (CME). The study, performed relative to several event planes for different input “CME signals”, indicates a detection threshold for the fraction fCME= ΔγCME/Δγ, which renders the Δγ-correlator insensitive to values of the Fourier dipole coefficient a1 smaller than about 2.5%, that is larger than the purported signal (signal difference) for ion-ion (isobaric) collisions. By contrast, the RΨ2 correlator indicates concave-shaped distributions with inverse widths (σ$$^{-1}_{RΨ_2}$$) that are linearly proportional to a1, and independent of the character of the event plane used for their extraction. The sensitivity of the RΨ2 correlator to minimal CME-driven charge separation in the presence of realistic backgrounds, could aid better characterization of the CME in heavy-ion collisions.

Authors:
; ; ; ORCiD logo
Publication Date:
Research Org.:
Univ. of Illinois, Chicago, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1659349
Alternate Identifier(s):
OSTI ID: 1782858
Report Number(s):
DOE-UIC-ER-40865-J2021-5
Journal ID: ISSN 0370-2693; S0370269320305748; 135771; PII: S0370269320305748
Grant/Contract Number:  
FG02-87ER40331.A008; FG02-94ER40865
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Magdy, Niseem, Nie, Mao-Wu, Ma, Guo-Liang, and Lacey, Roy A. A sensitivity study of the primary correlators used to characterize chiral-magnetically-driven charge separation. Netherlands: N. p., 2020. Web. https://doi.org/10.1016/j.physletb.2020.135771.
Magdy, Niseem, Nie, Mao-Wu, Ma, Guo-Liang, & Lacey, Roy A. A sensitivity study of the primary correlators used to characterize chiral-magnetically-driven charge separation. Netherlands. https://doi.org/10.1016/j.physletb.2020.135771
Magdy, Niseem, Nie, Mao-Wu, Ma, Guo-Liang, and Lacey, Roy A. Tue . "A sensitivity study of the primary correlators used to characterize chiral-magnetically-driven charge separation". Netherlands. https://doi.org/10.1016/j.physletb.2020.135771.
@article{osti_1659349,
title = {A sensitivity study of the primary correlators used to characterize chiral-magnetically-driven charge separation},
author = {Magdy, Niseem and Nie, Mao-Wu and Ma, Guo-Liang and Lacey, Roy A.},
abstractNote = {A Multi-Phase Transport (AMPT) model is used to study the detection sensitivity of two of the primary correlators – Δγ and RΨ2 – employed to characterize charge separation induced by the Chiral Magnetic Effect (CME). The study, performed relative to several event planes for different input “CME signals”, indicates a detection threshold for the fraction fCME= ΔγCME/Δγ, which renders the Δγ-correlator insensitive to values of the Fourier dipole coefficient a1 smaller than about 2.5%, that is larger than the purported signal (signal difference) for ion-ion (isobaric) collisions. By contrast, the RΨ2 correlator indicates concave-shaped distributions with inverse widths (σ$^{-1}_{RΨ_2}$) that are linearly proportional to a1, and independent of the character of the event plane used for their extraction. The sensitivity of the RΨ2 correlator to minimal CME-driven charge separation in the presence of realistic backgrounds, could aid better characterization of the CME in heavy-ion collisions.},
doi = {10.1016/j.physletb.2020.135771},
journal = {Physics Letters B},
number = ,
volume = ,
place = {Netherlands},
year = {2020},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.physletb.2020.135771

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