Observation of charge-dependent azimuthal correlations in $p$-Pb collisions and its implication for the search for the chiral magnetic effect - INSPIRE

DataBETA

Observation of charge-dependent azimuthal correlations in $p$ -Pb collisions and its implication for the search for the chiral magnetic effect

CMS

Collaboration

Oct 2, 2016

17 pages

Published in:

Phys.Rev.Lett. 118 (2017) 12, 122301

Published: Mar 24, 2017

e-Print:

1610.00263 [nucl-ex]

DOI:

10.1103/PhysRevLett.118.122301

Report number:

CMS-HIN-16-009,
CERN-EP-2016-236

Experiments:

CERN-LHC-CMS

View in:

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Abstract: (APS)

Charge-dependent azimuthal particle correlations with respect to the second-order event plane in p-Pb and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV have been studied with the CMS experiment at the LHC. The measurement is performed with a three-particle correlation technique, using two particles with the same or opposite charge within the pseudorapidity range |η|<2.4, and a third particle measured in the hadron forward calorimeters (4.4<|η|<5). The observed differences between the same and opposite sign correlations, as functions of multiplicity and η gap between the two charged particles, are of similar magnitude in p-Pb and PbPb collisions at the same multiplicities. These results pose a challenge for the interpretation of charge-dependent azimuthal correlations in heavy ion collisions in terms of the chiral magnetic effect.

Note:

Replaced with the published version. Added the journal reference and DOI. All the figures and tables, including additional supplemental figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-16-009/index.html

angular correlation: charge dependence
effect: magnetic
multiplicity
chiral
charged particle
nucleon nucleon
heavy ion: scattering
lead
vertex
correlation: charge dependence

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