News on collectivity in Pb-Pb collisions (CMS)

The flow anisotropies with the fourier coefficients (n = 2, 3) for the charged particles produced in PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV is studied with the CMS detector. In order to extract the fourier coefficients, several methods were used, such as the scalar product method or multi-particle cumulant method. The results cover both of the low-$p_T$ region (1 $< p_{T} <$ 3 GeV/c) associated with hydrodynamic flow phenomena and the high-$p_T$ region where anisotropic azimuthal distributions may reflect the path-length dependence of the parton energy loss in the created medium for the seven bins of collision centrality, spanning the rang of 0-60\% most-central events.