The Fourier coefficients v2 and v3 characterizing the anisotropy of the azimuthal distribution of charged
particles produced in PbPb collisions at √sNN = 5.02 TeV are measured with data collected by the CMS
experiment. The measurements cover a broad transverse momentum range, 1 < pT < 100 GeV/c. The
analysis focuses on the pT > 10 GeV/c range, where anisotropic azimuthal distributions should reflect the
path-length dependence of parton energy loss in the created medium. Results are presented in several
bins of PbPb collision centrality, spanning the 60% most central events. The v2 coefficient is measured
with the scalar product and the multiparticle cumulant methods, which have different sensitivities to
initial-state fluctuations. The values from both methods remain positive up to pT ∼ 60–80 GeV/c, in all
examined centrality classes. The v3 coefficient, only measured with the scalar product method, tends to
zero for pT 20 GeV/c. Comparisons between theoretical calculations and data provide new constraints
on the path-length dependence of parton energy loss in heavy ion collisions and highlight the importance
of the initial-state fluctuations