Search for Chiral Magnetic Effects in High-Energy Nuclear Collisions

Wang, Gang

doi:10.1016/j.nuclphysa.2013.01.069

Cited by 85 publications

(71 citation statements)

References 34 publications

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“…On the other hand, including also a strong and long-lived magnetic field but neglecting the Lorentz force can lead to a splitting between the elliptic flows of negatively and positively charged particles. However, the slope parameter in the charge asymmetry dependence of the elliptic flow splitting is smaller than the experimental data, while the positive intercept at zero charge asymmetry is larger than the experimental value [31]. Unfortunately, as in our previous study including only the magnetic field [22], the inclusion of the Lorentz force cancells the chiral effects due to the magnetic and vorticity fields and leads instead to a negative slope parameter in the charge symmetry dependence of the elliptic flow splitting of negatively and positively charged particles, contrary to that observed in experiments.…”

Section: Discussioncontrasting

confidence: 57%

Chiral vortical and magnetic effects in the anomalous transport model

Sun

2017

Phys. Rev. C

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We extend our recent study of chiral magnetic effect in relativistic heavy ion collisions based on an anomalous transport model by including also the chiral vortical effect. We find that although vorticities in the chirally restored quark matter, which result from the large angular momentum in non-central collisions, can generate an axial charge dipole moment in the transverse plane of a heavy ion collision, it does not produce a difference in the eccentricities of negatively and positively charged particles. As a result, including the chiral vortical effect alone cannot lead to a splitting between the elliptic flows of negatively and positively charged particles. On the other hand, negatively and positively charged particles do develop a splitting in their elliptic flows if the effect due to a strong and long-lived magnetic field is also included. However, to have a positive slope in the dependence of the elliptic flow splitting on the charge asymmetry of the quark matter, as seen in experiments, requires the neglect of the effect of the Lorentz force. In this case, an elliptic flow splitting appears even at vanishing charge asymmetry.

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Section: Discussioncontrasting

confidence: 57%

Chiral vortical and magnetic effects in the anomalous transport model

Sun

2017

Phys. Rev. C

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“…for some p T selection and, more importantly, some η acceptance. Indeed, this observable has been proposed theoretically [4] and measured experimentally in Au-Au collisions at √ s NN = 200 GeV by the STAR collaboration [5]. However, one of the issues with this observable is that the slope of v n vs A is not independent of experimental effects (for example tracking efficiency) and therefore requires a correction factor.…”

Section: Methodology and Observablesmentioning

confidence: 98%

Charge-dependent anisotropic flow studies and the search for the Chiral Magnetic Wave in ALICE

Belmont

2014

Nuclear Physics A

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Theoretical calculations have shown the possibility of P-violating bubbles in the QCD vacuum, which in combination with the strong magnetic field created in off-central heavy-ion collisions lead to novel effects such as the Chiral Magnetic Effect (CME) and the Chiral Separation Effect (CSE). A coupling between the CME and the CSE produces a wave-like excitation called the Chiral Magnetic Wave (CMW). The CMW produces a quadrupole moment that always has the same sign and is therefore present in an average over events. In this talk we present a series of charge-dependent anisotropic flow measurements in Pb-Pb collisions at √ s NN = 2.76 TeV in ALICE, using two-and three-particle correlators with unidentified hadrons. The relation of these measurements to the search for the CMW is discussed.

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“…In the theoretical work on the CMW [22][23][24]28,29] as well as the analysis published by STAR [30] of Au-Au collisions at √ s NN = 200 GeV, the observable has been the charge-dependent flow coefficient v ± n as a function of the charge asymmetry A. Experimentally, the charge asymmetry defined in a specified kinematic region must be corrected for detector efficiency, as discussed in [30][31][32]. The effect of the correction is to increase the slope of positive or negative particle v ± n vs A.…”

Section: Analysis Methodologymentioning

confidence: 99%

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

Adam¹,

Adamová²,

Aggarwal³

et al. 2016

Phys. Rev. C

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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.

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Search for Chiral Magnetic Effects in High-Energy Nuclear Collisions

Cited by 85 publications

References 34 publications

Chiral vortical and magnetic effects in the anomalous transport model

Chiral vortical and magnetic effects in the anomalous transport model

Charge-dependent anisotropic flow studies and the search for the Chiral Magnetic Wave in ALICE

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

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