Probing the chiral magnetic wave in pPb and PbPb collisions at root S-NN=5.02 TeV using charge-dependent azimuthal anisotropies

Charge-dependent anisotropy Fourier coefficients (v(n)) of particleazimuthal distributions are measured in pPb and PbPb collisions at rootS-NN = 5.02 TeV with the CMS detector at the LHC. The normalizeddifference in the second-order anisotropy coefficients (v(2)) betweenpositively and negatively charged particles is found to depend linearlyon the observed event charge asymmetry with comparable slopes for bothpPb and PbPb collisions over a wide range of charged particlemultiplicity. In PbPb, the third-order anisotropy coefficient v(3) showsa similar linear dependence with the same slope as seen for v(2). Theobserved similarities between the v(2) slopes for pPb and PbPb, as wellas the similar slopes for v(2) and v(3) in PbPb, are compatible withexpectations based on local charge conservation in the decay of clustersor resonances, and constitute a challenge to the hypothesis that, at LHCenergies, the observed charge asymmetry dependence of v(2) in heavy ioncollisions arises from a chiral magnetic wave.