  Charge-dependent azimuthal particle correlations with respect to the
second-order event plane in pPb 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 abs(eta) < 2.4, and a third particle measured in the
hadron forward calorimeters (4.4 < abs(eta) < 5). The observed differences
between the same and opposite sign correlations, as functions of multiplicity
and eta gap between the two charged particles, are of similar magnitude in pPb
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.
