dc.contributor.author Tu, ZhoudunmingCMS Collaboration 2018-12-03T18:42:10Z 2018-12-03T18:42:10Z 2017 Tu, Zhoudunming and CMS Collaboration. "Charge-dependent azimuthal correlations in pPb collisions with CMS experiment." Nuclear Physics A, 967, (2017) Elsevier: 744-747. https://doi.org/10.1016/j.nuclphysa.2017.05.089. https://hdl.handle.net/1911/103760 Charge-dependent azimuthal correlations relative to the event plane in AA collisions have been suggested as providing evidence for the chiral magnetic effect (CME) caused by local strong parity violation. However, the observation of the CME remains inconclusive because of several possible sources of background correlations that may account for part or all of the observed signals. This talk will present the first application of three-particle, charge-dependent azimuthal correlation analysis in proton-nucleus collisions, using pPb data collected with the CMS experiment at the LHC at SNN=5.02 TeV. The differences found in comparing same and opposite sign correlations are studied as a function of event multiplicity and the pseudorapidity gap between two of the particles detected in the CMS tracker detector. After selecting events with comparable charge-particle multiplicities, the results for pPb collisions are found to be similar to those for PbPb collisions collected at the same collision energy. With a reduced magnetic field strength and a random field orientation in high multiplicity pPb events, the CME contribution to any charge separation signal is expected to be much smaller than found in peripheral PbPb events. These results pose a challenge for the interpretation of charge-dependent azimuthal correlations in heavy ion collisions in terms of the chiral magnetic effect. eng Elsevier This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). https://creativecommons.org/licenses/by/4.0/ Charge-dependent azimuthal correlations in pPb collisions with CMS experiment Journal article Nuclear Physics A heavy ion physicssmall systemschiral magnetic effectlocal parity violation 967 Text https://doi.org/10.1016/j.nuclphysa.2017.05.089 publisher version 744 747
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