skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions

Abstract

We present measurements of π⁻ and π⁺ elliptic flow, v₂, at midrapidity in Au+Au collisions at √s NN = 200, 62.4, 39, 27, 19.6, 11.5, and 7.7 GeV, as a function of event-by-event charge asymmetry, A ch, based on data from the STAR experiment at RHIC. We find that π⁻ (π⁺) elliptic flow linearly increases (decreases) with charge asymmetry for most centrality bins at √s NN = 27 GeV and higher. At √s NN = 200 GeV, the slope of the difference of v₂ between π⁻ and π⁺ as a function of A ch exhibits a centrality dependence, which is qualitatively similar to calculations that incorporate a chiral magnetic wave effect. In addition, similar centrality dependence is also observed at lower energies.

Authors:
 [1]
  1. AGH Univ. of Science and Technology, Cracow (Poland). et al.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1213396
Alternate Identifier(s):
OSTI ID: 1198529
Report Number(s):
BNL-108305-2015-JA
Journal ID: ISSN 0031-9007; PRLTAO; R&D Project: PO 004; KB0202012
Grant/Contract Number:  
SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 25; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; relativistic heavy ion collider

Citation Formats

Adamczyk, L. Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions. United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.114.252302.
Adamczyk, L. Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions. United States. doi:10.1103/PhysRevLett.114.252302.
Adamczyk, L. Fri . "Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions". United States. doi:10.1103/PhysRevLett.114.252302. https://www.osti.gov/servlets/purl/1213396.
@article{osti_1213396,
title = {Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions},
author = {Adamczyk, L.},
abstractNote = {We present measurements of π⁻ and π⁺ elliptic flow, v₂, at midrapidity in Au+Au collisions at √sNN = 200, 62.4, 39, 27, 19.6, 11.5, and 7.7 GeV, as a function of event-by-event charge asymmetry, Ach, based on data from the STAR experiment at RHIC. We find that π⁻ (π⁺) elliptic flow linearly increases (decreases) with charge asymmetry for most centrality bins at √sNN = 27 GeV and higher. At √sNN = 200 GeV, the slope of the difference of v₂ between π⁻ and π⁺ as a function of Ach exhibits a centrality dependence, which is qualitatively similar to calculations that incorporate a chiral magnetic wave effect. In addition, similar centrality dependence is also observed at lower energies.},
doi = {10.1103/PhysRevLett.114.252302},
journal = {Physical Review Letters},
number = 25,
volume = 114,
place = {United States},
year = {2015},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

Figures / Tables:

FIG. 1 FIG. 1: (a) the distribution of observed charge asymmetry from STAR data and, (b) the relationship between the observed charge asymmetry and the charge asymmetry from HIJING generated events, for 30-40% central Au+Au collisions at 200 GeV. In this centrality, the mean charge asymmetry $\langle$Ach$\rangle$ of HIJING events is aboutmore » 0.004. The errors are statistical only.« less

Save / Share:

Works referenced in this record:

Observation of charge-dependent azimuthal correlations and possible local strong parity violation in heavy-ion collisions
journal, May 2010


New method for measuring azimuthal distributions in nucleus-nucleus collisions
journal, April 2001


Testing the Chiral Magnetic and Chiral Vortical Effects in Heavy Ion Collisions
journal, February 2011


Hydrodynamics at large baryon densities: Understanding proton versus anti-proton v 2 and other puzzles
journal, October 2012


Measurement of charge multiplicity asymmetry correlations in high-energy nucleus-nucleus collisions at s N N = 200 GeV
journal, April 2014


Realistic implementation of chiral magnetic wave in heavy ion collisions
journal, April 2014


Remarks on possible local parity violation in heavy ion collisions
journal, March 2010


Charge separation effect in relativistic heavy ion collisions
journal, November 2010


Microscopic models for ultrarelativistic heavy ion collisions
journal, January 1998


Azimuthal anisotropy in Au+Au collisions at s NN = 200 GeV
journal, July 2005


New method for the experimental study of topological effects in the quark-gluon plasma
journal, January 2011


Chiral Magnetic Wave at Finite Baryon Density and the Electric Quadrupole Moment of the Quark-Gluon Plasma
journal, July 2011


Charge separation relative to the reaction plane in Pb-Pb collisions at s N N = 2.76 TeV
journal, January 2013


Constituent quark scaling violation due to baryon number transport
journal, October 2011


Effects of hadronic potentials on elliptic flows in relativistic heavy ion collisions
journal, April 2012


Anomalous axion interactions and topological currents in dense matter
journal, August 2005


Methods for analyzing anisotropic flow in relativistic nuclear collisions
journal, September 1998


Partonic effects on the elliptic flow at relativistic heavy ion collisions
journal, February 2002


Inclusive charged hadron elliptic flow in Au + Au collisions at s N N = 7.7 –39 GeV
journal, November 2012


Chiral magnetic effect
journal, October 2008


Topologically induced local <mml:math altimg="si13.gif" display="inline" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:mrow><mml:mi mathvariant="script">P</mml:mi><mml:mspace width="0.35em"/><mml:mtext>and</mml:mtext><mml:mspace width="0.35em"/><mml:mi mathvariant="script">CP</mml:mi></mml:mrow></mml:math> violation in QCD×QED
journal, January 2010


Relativistic hadron-hadron collisions in the ultra-relativistic quantum molecular dynamics model
journal, September 1999

  • Bleicher, M.; Zabrodin, E.; Spieles, C.
  • Journal of Physics G: Nuclear and Particle Physics, Vol. 25, Issue 9
  • DOI: 10.1088/0954-3899/25/9/308

Anomalous hydrodynamics
journal, January 2006


hijing: A Monte Carlo model for multiple jet production in pp , pA , and AA collisions
journal, December 1991


Normal ground state of dense relativistic matter in a magnetic field
journal, April 2011


Flow study in relativistic nuclear collisions by Fourier expansion of azimuthal particle distributions
journal, May 1996

  • Voloshin, S.; Zhang, Y.
  • Zeitschrift f�r Physik C Particles and Fields, Vol. 70, Issue 4
  • DOI: 10.1007/s002880050141

HIJING 1.0: A Monte Carlo program for parton and particle production in high energy hadronic and nuclear collisions
journal, December 1994


Elliptic flow in the Gaussian model of eccentricity fluctuations
journal, January 2008


Can baryon stopping explain the breakdown of constituent quark scaling and proposed signals of chiral magnetic waves at RHIC?
journal, September 2013


The STAR time projection chamber: a unique tool for studying high multiplicity events at RHIC
journal, March 2003

  • Anderson, M.; Berkovitz, J.; Betts, W.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 499, Issue 2-3
  • DOI: 10.1016/S0168-9002(02)01964-2

The effects of topological charge change in heavy ion collisions: “Event by event and violation”
journal, May 2008


Observation of an Energy-Dependent Difference in Elliptic Flow between Particles and Antiparticles in Relativistic Heavy Ion Collisions
journal, April 2013


Beam-Energy Dependence of Charge Separation along the Magnetic Field in Au + Au Collisions at RHIC
journal, July 2014


Partonic mean-field effects on matter and antimatter elliptic flows
journal, August 2014


Partonic effects on anisotropic flows at RHIC
journal, March 2005

  • Chen, Lie-Wen; Ko, Che Ming
  • Journal of Physics G: Nuclear and Particle Physics, Vol. 31, Issue 4
  • DOI: 10.1088/0954-3899/31/4/007

Parity violation in hot QCD: Why it can happen, and how to look for it
journal, February 2006


Contributions to the event-by-event charge asymmetry dependence for the elliptic flow of <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math> and <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:math> in heavy-ion collisions
journal, October 2013


Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation
journal, December 2009


Quantum anomalies in dense matter
journal, October 2004


Azimuthally fluctuating magnetic field and its impacts on observables in heavy-ion collisions
journal, January 2013


Chiral magnetic wave in an expanding QCD fluid
journal, February 2015


The STAR trigger
journal, March 2003

  • Bieser, F. S.; Crawford, H. J.; Engelage, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 499, Issue 2-3
  • DOI: 10.1016/S0168-9002(02)01974-5

Effect of flow fluctuations and nonflow on elliptic flow methods
journal, July 2009

  • Ollitrault, Jean-Yves; Poskanzer, Arthur M.; Voloshin, Sergei A.
  • Physical Review C, Vol. 80, Issue 1
  • DOI: 10.1103/PhysRevC.80.014904

Charge separation induced by -odd bubbles in QCD matter
journal, December 2007


Charged elliptic flow at zero charge asymmetry
journal, July 2013


Flow analysis with cumulants: Direct calculations
journal, April 2011


    Works referencing / citing this record:

    Anomaly-Induced Transport Phenomena from Imaginary-Time Formalism
    journal, May 2019


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.