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Charge-dependent flow and the search for the chiral magnetic wave in Pb-Pb collisions at sNN =2.76 TeV

Adam, J. ; Christiansen, Peter LU ; Ljunggren, Martin LU ; Oskarsson, Anders LU ; Richert, Tuva LU ; Silvermyr, David LU orcid ; Sogaard, Carsten LU ; Stenlund, Evert LU ; Vislavicius, Vytautas LU and Zyzak, M. (2016) In Physical Review C 93(4).
Abstract
We report on measurements of a charge-dependent flow using a novel three-particle correlator with ALICE in Pb-Pb collisions at the CERN Large Hadron Collider (LHC), and discuss the implications for observation of local parity violation and the chiral magnetic wave (CMW) in heavy-ion collisions. Charge-dependent flow is reported for different collision centralities as a function of the event charge asymmetry. While our results are in qualitative agreement with expectations based on the CMW, the nonzero signal observed in higher harmonics correlations indicates a possible significant background contribution. We also present results on a differential correlator, where the flow of positive and negative charges is reported as a function of the... (More)
We report on measurements of a charge-dependent flow using a novel three-particle correlator with ALICE in Pb-Pb collisions at the CERN Large Hadron Collider (LHC), and discuss the implications for observation of local parity violation and the chiral magnetic wave (CMW) in heavy-ion collisions. Charge-dependent flow is reported for different collision centralities as a function of the event charge asymmetry. While our results are in qualitative agreement with expectations based on the CMW, the nonzero signal observed in higher harmonics correlations indicates a possible significant background contribution. We also present results on a differential correlator, where the flow of positive and negative charges is reported as a function of the mean charge of the particles and their pseudorapidity separation. We argue that this differential correlator is better suited to distinguish the differences in positive and negative charges expected due to the CMW and the background effects, such as local charge conservation coupled with strong radial and anisotropic flow. © 2016 CERN. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C
volume
93
issue
4
article number
044903
publisher
American Physical Society
external identifiers
  • scopus:85007282111
ISSN
2469-9985
DOI
10.1103/PhysRevC.93.044903
language
English
LU publication?
yes
id
11a2393a-1474-4268-baac-86e493c8deba
date added to LUP
2022-03-31 12:53:54
date last changed
2025-04-04 14:08:30
@article{11a2393a-1474-4268-baac-86e493c8deba,
  abstract     = {{We report on measurements of a charge-dependent flow using a novel three-particle correlator with ALICE in Pb-Pb collisions at the CERN Large Hadron Collider (LHC), and discuss the implications for observation of local parity violation and the chiral magnetic wave (CMW) in heavy-ion collisions. Charge-dependent flow is reported for different collision centralities as a function of the event charge asymmetry. While our results are in qualitative agreement with expectations based on the CMW, the nonzero signal observed in higher harmonics correlations indicates a possible significant background contribution. We also present results on a differential correlator, where the flow of positive and negative charges is reported as a function of the mean charge of the particles and their pseudorapidity separation. We argue that this differential correlator is better suited to distinguish the differences in positive and negative charges expected due to the CMW and the background effects, such as local charge conservation coupled with strong radial and anisotropic flow. © 2016 CERN.}},
  author       = {{Adam, J. and Christiansen, Peter and Ljunggren, Martin and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Sogaard, Carsten and Stenlund, Evert and Vislavicius, Vytautas and Zyzak, M.}},
  issn         = {{2469-9985}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C}},
  title        = {{Charge-dependent flow and the search for the chiral magnetic wave in Pb-Pb collisions at sNN =2.76 TeV}},
  url          = {{http://dx.doi.org/10.1103/PhysRevC.93.044903}},
  doi          = {{10.1103/PhysRevC.93.044903}},
  volume       = {{93}},
  year         = {{2016}},
}