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

Tu, Zhoudunming and Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Md. Ali, Mohd. Adli (2019) Search for the chiral magnetic effect at the LHC with the CMS experiment. Nuclear Physics A, 982. pp. 527-530. ISSN 0375-9474

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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 (v2) is observed, and the upper limits on the v2-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 (Journal)
Additional Information:	7861/71940
Uncontrolled Keywords:	CME, Small Systems, Particle Correlation, Event Shape Engineering
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	02 May 2019 16:26
Last Modified:	11 Apr 2020 21:10
URI:	http://irep.iium.edu.my/id/eprint/71940

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