Abstract

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 5.02TeV 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.

Highlights

  • In relativistic heavy ion collisions, metastable domains of gluon fields may form with nontrivial topological configurations [1,2,3,4]

  • The charge separation can be characterized by the P-odd sine term (a1) in a Fourier decomposition of the particle azimuthal distribution [12]: dN dφ

  • Measurements of the charge-dependent three-particle correlator are shown in Fig. 1 as a function of the jΔηj between charged particles α and β with the same and opposite signs, in 220 for p-Pb and the multiplicity PbPb collisions raatngpeffisffiffiN1ffiffiN8ffiffi51⁄4≤5N.0ot2rfkflTinee V

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Summary

Introduction

In relativistic heavy ion collisions, metastable domains of gluon fields may form with nontrivial topological configurations [1,2,3,4]. The measurement is presented in different charge combinations as functions of event multiplicity and pseudorapidity (η) difference of correlated particles. [35], are used to define the event charged-particle multiplicity (Notrfkfline) and to perform correlation measurements.

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