
Open access
Author
Date
2019-02Type
- Journal Article
Abstract
Searches for the chiral magnetic effect (CME) using charge-dependent azimuthal correlations with respect to event planes are presented in PbPb collisions at 5.02 TeV and pPb collisions at 5.02 and 8.16 TeV, with the CMS experiment at the LHC. The azimuthal correlations with respect to the second- and third-order event planes are explored as a function of pseudorapidity, transverse momentum, and event multiplicity, which provides new insights into the underlying background correlations. By employing an event-shape engineering technique, a linear dependence of charge-dependent correlations on the second-order anisotropy flow (ν2) is observed, and the upper limits on the ν2-independent fraction, which is directly related to the CME signal, are obtained at 95% confidence level for both pPb and PbPb collisions. These results provide strong constraints on the search for the chiral magnetic effect at LHC energies, and establish new guidelines for searches in future experiments. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000328672Publication status
publishedExternal links
Journal / series
Nuclear Physics AVolume
Pages / Article No.
Publisher
ElsevierSubject
CME; Small Systems; Particle Correlation; Event Shape EngineeringNotes
Author on the behalf of the CMS CollaborationMore
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