New results on collectivity with CMS

Nonlinear response coefficients of higher-order anisotropy harmonics for charged particles are measured in PbPb collisions at 2.76 and 5.02 TeV as a function of transverse momentum and collision centrality. The nonlinear response coefficients are obtained from $v_n$ harmonics measured with respect to their own plane and the mixed harmonics. Additionally, at 5.02 TeV PbPb collisions, a significant negative skewness is observed by a fine splitting between $v_2\{4\}$ and $v_2\{6\}$ cumulants. The elliptic flow skewness is measured up to 60% centrality. The results are compared with hydrodynamic models with different shear viscosity to entropy density ratios and initial conditions.