Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider

Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider

Charge-dependent azimuthal correlations of same- and opposite-sign pairs with respect to the second- and thirdorder event planes have been measured in pPb collisions at √sNN = 8.16 TeV and PbPb collisions at 5.02 TeV with the CMS experiment at the LHC. The measurement is motivated by the search fo...

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Main Authors: Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Ambrogi, Federico, Asilar, Ece, Md. Ali, Mohd. Adli
Format: Article
Language:English
English
English
Published: American Physical Society 2018
Subjects:
Q Science (General)
QC Physics
Online Access:http://irep.iium.edu.my/65494/
http://irep.iium.edu.my/65494/
http://irep.iium.edu.my/65494/
http://irep.iium.edu.my/65494/1/65494_Constraints%20on%20the%20chiral%20magnetic%20effect_article.pdf
http://irep.iium.edu.my/65494/2/65494_Constraints%20on%20the%20chiral%20magnetic%20effect_scopus.pdf
http://irep.iium.edu.my/65494/13/65494_Constraints%20on%20the%20chiral%20magnetic%20effect%20using%20charge-dependent%20azimuthal%20correlations%20in%20pPb%20and%20PbPb%20collisions%20at%20the%20CERN%20Large%20Hadron%20Collider_WOS.pdf
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recordtype eprints
spelling iium-654942019-01-24T02:24:24Z http://irep.iium.edu.my/65494/ Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider Sirunyan, A. M. Tumasyan, A. R. Adam, Wolfgang Ambrogi, Federico Asilar, Ece Md. Ali, Mohd. Adli Q Science (General) QC Physics Charge-dependent azimuthal correlations of same- and opposite-sign pairs with respect to the second- and thirdorder event planes have been measured in pPb collisions at √sNN = 8.16 TeV and PbPb collisions at 5.02 TeV with the CMS experiment at the LHC. The measurement is motivated by the search for the charge separation phenomenon predicted by the chiral magnetic effect (CME) in heavy ion collisions. Three- and two-particle azimuthal correlators are extracted as functions of the pseudorapidity difference, the transverse momentum (pT) difference, and the pT average of same- and opposite-charge pairs in various event multiplicity ranges. The data suggest that the charge-dependent three-particle correlators with respect to the second- and third-order event planes share a common origin, predominantly arising from charge-dependent two-particle azimuthal correlations coupled with an anisotropic flow. The CME is expected to lead to a v2-independent three-particle correlation when the magnetic field is fixed. Using an event shape engineering technique, upper limits on the v2-independent fraction of the three-particle correlator are estimated to be 13% for pPb and 7% for PbPb collisions at 95% confidence level. The results of this analysis, both the dominance of two-particle correlations as a source of the three-particle results and the similarities seen between PbPb and pPb, provide stringent constraints on the origin of charge-dependent three-particle azimuthal correlations and challenge their interpretation as arising from a chiral magnetic effect in heavy ion collisions. American Physical Society 2018-04-23 Article PeerReviewed application/pdf en http://irep.iium.edu.my/65494/1/65494_Constraints%20on%20the%20chiral%20magnetic%20effect_article.pdf application/pdf en http://irep.iium.edu.my/65494/2/65494_Constraints%20on%20the%20chiral%20magnetic%20effect_scopus.pdf application/pdf en http://irep.iium.edu.my/65494/13/65494_Constraints%20on%20the%20chiral%20magnetic%20effect%20using%20charge-dependent%20azimuthal%20correlations%20in%20pPb%20and%20PbPb%20collisions%20at%20the%20CERN%20Large%20Hadron%20Collider_WOS.pdf Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2018) Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider. Physical Review C, 97 (4). 044912-1. ISSN 2469-9985 E-ISSN 2469-9993 https://journals.aps.org/prc/pdf/10.1103/PhysRevC.97.044912 10.1103/PhysRevC.97.044912
repository_type Digital Repository
institution_category Local University
institution International Islamic University Malaysia
building IIUM Repository
collection Online Access
language English
English
English
topic Q Science (General)
QC Physics
spellingShingle Q Science (General)
QC Physics
Sirunyan, A. M.
Tumasyan, A. R.
Adam, Wolfgang
Ambrogi, Federico
Asilar, Ece
Md. Ali, Mohd. Adli
Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider
description Charge-dependent azimuthal correlations of same- and opposite-sign pairs with respect to the second- and thirdorder event planes have been measured in pPb collisions at √sNN = 8.16 TeV and PbPb collisions at 5.02 TeV with the CMS experiment at the LHC. The measurement is motivated by the search for the charge separation phenomenon predicted by the chiral magnetic effect (CME) in heavy ion collisions. Three- and two-particle azimuthal correlators are extracted as functions of the pseudorapidity difference, the transverse momentum (pT) difference, and the pT average of same- and opposite-charge pairs in various event multiplicity ranges. The data suggest that the charge-dependent three-particle correlators with respect to the second- and third-order event planes share a common origin, predominantly arising from charge-dependent two-particle azimuthal correlations coupled with an anisotropic flow. The CME is expected to lead to a v2-independent three-particle correlation when the magnetic field is fixed. Using an event shape engineering technique, upper limits on the v2-independent fraction of the three-particle correlator are estimated to be 13% for pPb and 7% for PbPb collisions at 95% confidence level. The results of this analysis, both the dominance of two-particle correlations as a source of the three-particle results and the similarities seen between PbPb and pPb, provide stringent constraints on the origin of charge-dependent three-particle azimuthal correlations and challenge their interpretation as arising from a chiral magnetic effect in heavy ion collisions.
format Article
author Sirunyan, A. M.
Tumasyan, A. R.
Adam, Wolfgang
Ambrogi, Federico
Asilar, Ece
Md. Ali, Mohd. Adli
author_facet Sirunyan, A. M.
Tumasyan, A. R.
Adam, Wolfgang
Ambrogi, Federico
Asilar, Ece
Md. Ali, Mohd. Adli
author_sort Sirunyan, A. M.
title Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider
title_short Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider
title_full Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider
title_fullStr Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider
title_full_unstemmed Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider
title_sort constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in ppb and pbpb collisions at the cern large hadron collider
publisher American Physical Society
publishDate 2018
url http://irep.iium.edu.my/65494/
http://irep.iium.edu.my/65494/
http://irep.iium.edu.my/65494/
http://irep.iium.edu.my/65494/1/65494_Constraints%20on%20the%20chiral%20magnetic%20effect_article.pdf
http://irep.iium.edu.my/65494/2/65494_Constraints%20on%20the%20chiral%20magnetic%20effect_scopus.pdf
http://irep.iium.edu.my/65494/13/65494_Constraints%20on%20the%20chiral%20magnetic%20effect%20using%20charge-dependent%20azimuthal%20correlations%20in%20pPb%20and%20PbPb%20collisions%20at%20the%20CERN%20Large%20Hadron%20Collider_WOS.pdf
first_indexed 2023-09-18T21:32:56Z
last_indexed 2023-09-18T21:32:56Z
_version_ 1777412631475257344

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