Observation of charge-dependent azimuthal correlations in p-Pb collisions and its implication for the search for the chiral magnetic effect

CMS Collaboration

Research output: Contribution to journalArticleResearchpeer-review

59 Citations (Scopus)

Abstract

Charge-dependent azimuthal particle correlations with respect to the second-order event plane in p-Pb and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV have been studied with the CMS experiment at the LHC. The measurement is performed with a three-particle correlation technique, using two particles with the same or opposite charge within the pseudorapidity range |η| < 2.4, and a third particle measured in the hadron forward calorimeters (4.4 < |η| < 5). The observed differences between the same and opposite sign correlations, as functions of multiplicity and η gap between the two charged particles, are of similar magnitude in p-Pb and PbPb collisions at the same multiplicities. These results pose a challenge for the interpretation of charge-dependent azimuthal correlations in heavy ion collisions in terms of the chiral magnetic effect.
Original languageEnglish
Article number122301
Number of pages17
JournalPhysical Review Letters
Volume118
Issue number12
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • Magnetic effects
  • Chiral kinetic
  • Ionic collisions

Cite this

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title = "Observation of charge-dependent azimuthal correlations in p-Pb collisions and its implication for the search for the chiral magnetic effect",
abstract = "Charge-dependent azimuthal particle correlations with respect to the second-order event plane in p-Pb and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV have been studied with the CMS experiment at the LHC. The measurement is performed with a three-particle correlation technique, using two particles with the same or opposite charge within the pseudorapidity range |η| < 2.4, and a third particle measured in the hadron forward calorimeters (4.4 < |η| < 5). The observed differences between the same and opposite sign correlations, as functions of multiplicity and η gap between the two charged particles, are of similar magnitude in p-Pb and PbPb collisions at the same multiplicities. These results pose a challenge for the interpretation of charge-dependent azimuthal correlations in heavy ion collisions in terms of the chiral magnetic effect.",
keywords = "Magnetic effects, Chiral kinetic, Ionic collisions",
author = "J Nash and {CMS Collaboration}",
year = "2017",
doi = "10.1103/PhysRevLett.118.122301",
language = "English",
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journal = "Physical Review Letters",
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Observation of charge-dependent azimuthal correlations in p-Pb collisions and its implication for the search for the chiral magnetic effect. / CMS Collaboration.

In: Physical Review Letters, Vol. 118, No. 12, 122301, 2017.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Observation of charge-dependent azimuthal correlations in p-Pb collisions and its implication for the search for the chiral magnetic effect

AU - Nash, J

AU - CMS Collaboration

PY - 2017

Y1 - 2017

N2 - Charge-dependent azimuthal particle correlations with respect to the second-order event plane in p-Pb and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV have been studied with the CMS experiment at the LHC. The measurement is performed with a three-particle correlation technique, using two particles with the same or opposite charge within the pseudorapidity range |η| < 2.4, and a third particle measured in the hadron forward calorimeters (4.4 < |η| < 5). The observed differences between the same and opposite sign correlations, as functions of multiplicity and η gap between the two charged particles, are of similar magnitude in p-Pb and PbPb collisions at the same multiplicities. These results pose a challenge for the interpretation of charge-dependent azimuthal correlations in heavy ion collisions in terms of the chiral magnetic effect.

AB - Charge-dependent azimuthal particle correlations with respect to the second-order event plane in p-Pb and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV have been studied with the CMS experiment at the LHC. The measurement is performed with a three-particle correlation technique, using two particles with the same or opposite charge within the pseudorapidity range |η| < 2.4, and a third particle measured in the hadron forward calorimeters (4.4 < |η| < 5). The observed differences between the same and opposite sign correlations, as functions of multiplicity and η gap between the two charged particles, are of similar magnitude in p-Pb and PbPb collisions at the same multiplicities. These results pose a challenge for the interpretation of charge-dependent azimuthal correlations in heavy ion collisions in terms of the chiral magnetic effect.

KW - Magnetic effects

KW - Chiral kinetic

KW - Ionic collisions

U2 - 10.1103/PhysRevLett.118.122301

DO - 10.1103/PhysRevLett.118.122301

M3 - Article

VL - 118

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 12

M1 - 122301

ER -