Quantification of Chiral Magnetic Effect from Event-by-Event Anomalous-Viscous Fluid Mechanics

AbstractWe present a systematic study of the correlators used experimentally to probe the Chiral Magnetic Effect (CME) using the Anomalous Viscous Fluid Dynamics (AVFD) model in Pb–Pb and Xe–Xe collisions at LHC energies. We find a parametrization that describes the dependence of these correlators on the value of the axial current density ($$n_5/{\mathrm {s}}$$ n 5 / s ), which dictates the CME signal, and on the parameter that governs the background in these measurements i.e., the percentage of local charge conservation (LCC) within an event. This allows to deduce the values of $$n_5/{\mathrm {s}}$$ n 5 / s and the LCC percentage that provide a quantitative description of the centrality dependence of the experimental measurements. We find that the results in Xe–Xe collisions at $$\sqrt{s_{\mathrm {NN}}} = 5.44$$ s NN = 5.44 TeV are consistent with a background only scenario. On the other hand, the model needs a significant non-zero value of $$n_5/{\mathrm {s}}$$ n 5 / s to match the measurements in Pb–Pb collisions at $$\sqrt{s_{\mathrm {NN}}} = 5.02$$ s NN = 5.02 TeV.

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Quantifying the Chiral Magnetic Effect from Anomalous-Viscous Fluid Dynamics

Nuclear Physics A ◽

10.1016/j.nuclphysa.2017.06.006 ◽

2017 ◽

Vol 967 ◽

pp. 748-751

Author(s):

Shuzhe Shi ◽

Yin Jiang ◽

Elias Lilleskov ◽

Yi Yin ◽

Jinfeng Liao

Keyword(s):

Fluid Dynamics ◽

Viscous Fluid ◽

Magnetic Effect ◽

Chiral Magnetic Effect

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Spontaneous chiral symmetry breaking and chiral magnetic effect in Weyl semimetals

10.22323/1.214.0061 ◽

2015 ◽

Author(s):

Pavel Buividovich ◽

Matthias Puhr

Keyword(s):

Symmetry Breaking ◽

Chiral Symmetry ◽

Chiral Symmetry Breaking ◽

Magnetic Effect ◽

Spontaneous Chiral Symmetry Breaking ◽

Chiral Magnetic Effect ◽

Weyl Semimetals

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Deciphering the RΨm correlator in search for the chiral magnetic effect in relativistic heavy ion collisions

Physical Review C ◽

10.1103/physrevc.103.034912 ◽

2021 ◽

Vol 103 (3) ◽

Author(s):

Yicheng Feng ◽

Jie Zhao ◽

Hao-jie Xu ◽

Fuqiang Wang

Keyword(s):

Heavy Ion Collisions ◽

Heavy Ion ◽

Magnetic Effect ◽

Relativistic Heavy Ion Collisions ◽

Ion Collisions ◽

Chiral Magnetic Effect

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Constraining the Chiral Magnetic Effect with charge-dependent azimuthal correlations in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 2.76 and 5.02 TeV

Journal of High Energy Physics ◽

10.1007/jhep09(2020)160 ◽

2020 ◽

Vol 2020 (9) ◽

Author(s):

S. Acharya ◽

◽

D. Adamová ◽

A. Adler ◽

J. Adolfsson ◽

...

Keyword(s):

Charged Particles ◽

Magnetic Effect ◽

Anisotropic Flow ◽

Charge Conservation ◽

Particle Correlations ◽

Azimuthal Correlations ◽

Chiral Magnetic Effect ◽

Local Charge ◽

Peripheral Collisions ◽

Dependent Signal

Abstract Systematic studies of charge-dependent two- and three-particle correlations in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ s NN = 2.76 and 5.02 TeV used to probe the Chiral Magnetic Effect (CME) are presented. These measurements are performed for charged particles in the pseudorapidity (η) and transverse momentum (pT) ranges |η| < 0.8 and 0.2 < pT< 5 GeV/c. A significant charge-dependent signal that becomes more pronounced for peripheral collisions is reported for the CME-sensitive correlators γ1, 1 = 〈cos(φα + φβ − 2Ψ2)〉 and γ1, − 3 = 〈cos(φα − 3φβ + 2Ψ2)〉. The results are used to estimate the contribution of background effects, associated with local charge conservation coupled to anisotropic flow modulations, to measurements of the CME. A blast-wave parametrisation that incorporates local charge conservation tuned to reproduce the centrality dependent background effects is not able to fully describe the measured γ1,1. Finally, the charge and centrality dependence of mixed-harmonics three-particle correlations, of the form γ1, 2 = 〈cos(φα + 2φβ − 3Ψ3)〉, which are insensitive to the CME signal, verify again that background contributions dominate the measurement of γ1,1.

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