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Search for the chiral magnetic effect at the LHC with the CMS experiment

Tu, Zhoudunming and Anderson, D. and Bornheim, A. and Lawhorn, J. M. and Newman, H. B. and Nguyen, T. Q. and Spiropulu, M. and Vlimant, J. R. and Wilkinson, R. and Xie, S. and Zhang, Z. and Zhu, R. Y. (2019) Search for the chiral magnetic effect at the LHC with the CMS experiment. Nuclear Physics A, 982 . pp. 527-530. ISSN 0375-9474. doi:10.1016/j.nuclphysa.2018.08.032.

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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 (ν_2) 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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Bornheim, A.0000-0002-0128-0871
Lawhorn, J. M.0000-0002-8597-9259
Newman, H. B.0000-0003-0964-1480
Nguyen, T. Q.0000-0003-3954-5131
Spiropulu, M.0000-0001-8172-7081
Xie, S.0000-0003-2509-5731
Zhang, Z.0000-0002-1630-0986
Zhu, R. Y.0000-0003-3091-7461
Additional Information:© 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( Available online 22 January 2019.
Subject Keywords:CME; Small Systems; Particle Correlation; Event Shape Engineering
Record Number:CaltechAUTHORS:20190228-101333261
Persistent URL:
Official Citation:Zhoudunming Tu, Search for the chiral magnetic effect at the LHC with the CMS experiment, Nuclear Physics A, Volume 982, 2019, Pages 527-530, ISSN 0375-9474, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93333
Deposited By: Tony Diaz
Deposited On:28 Feb 2019 18:19
Last Modified:16 Nov 2021 16:56

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