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Title: Constraining the magnitude of the Chiral Magnetic Effect with Event Shape Engineering in Pb–Pb collisions at s NN =2.76 TeV

Journal Article · · Physics Letters. B
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In ultrarelativistic heavy-ion collision, the event-by-event variation of the elliptic flow v2 reflects fluctuations in the shape of the initial state of the system. This allows to select events with the same centrality but different initial geometry. This selection technique, Event Shape Engineering, has been used in the analysis of charge-dependent two- and three-particle correlations in Pb-Pb collisions at $$\sqrt{s}$$$$_ {NN}$$ = 2.76 TeV. The two-particle correlator $$\langle$$cos(φαβ)$$\rangle$$, calculated for different combinations of charges α and β, is almost independent of v2 (for a given centrality), while the three-particle correlator $$\langle$$cos(φαβ-2ψ2)$$\rangle$$ scales almost linearly both with the event v2 and charge-particle pseudorapidity density. The charge dependence of the three-particle correlator is often interpreted as evidence for the Chiral Magnetic Effect (CME), a parity violating effect of the strong interaction. However, its measured dependence on v2 points to a large non-CME contribution to the correlator. Comparing the results with Monte Carlo calculations including a magnetic field due to the spectators, the upper limit of the CME signal contribution to the three-particle correlator in the 10-15% centrality interval is found to be 26-33% at 95% confidence level.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE
Contributing Organization:
ALICE Collaboration
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725
OSTI ID:
1437788
Alternate ID(s):
OSTI ID: 1435125; OSTI ID: 1480608
Journal Information:
Physics Letters. B, Vol. 777, Issue C; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 57 works
Citation information provided by
Web of Science

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Cited By (7)

Back-to-back relative-excess observable to identify the chiral magnetic effect journal January 2020
Rotating solutions of nonideal transverse Chern-Simons magnetohydrodynamics journal October 2018
Chiral magnetic effect and an experimental bound on the late time magnetic field strength journal October 2018
Study of charged particle multiplicity, average transverse momentum and azimuthal anisotropy in Xe+Xe collisions at $\sqrt{s_{NN}} = 5.44$ TeV using AMPT model journal September 2019
Chiral magnetic effect and an experimental bound on the late time magnetic field strength text January 2018
Responses of the chiral-magnetic-effect-sensitive sine observable to resonance backgrounds in heavy-ion collisions text January 2018
The Chiral Magnetic Effect and an experimental bound on the late time magnetic field strength text January 2018


Figures / Tables (7)