Correlations and flow measurements in PbPb and pPb collisions with CMS

Measurements of two- and four-particle angular correlations for inclusive charged particles in pPb collisions at $\sqrt{s_{NN}} = 5.02$ TeV are presented over a wide pseudorapidity range, $abs(\eta) <$ 2.5 and full azimuth from the CMS experiment. Results from 31 $nb^{-1}$ of pPb data, collected during the 2013 LHC running are compared to 2.76 TeV semi~peripheral PbPb collision data, from 2011 PbPb run, having similar range of particle multiplicities. The second-order ($v_{2}$) and third-order ($v_{3}$) anisotropy harmonics are extracted using the two-particle azimuthal correlation technique. $v_{2}$ is also extracted using a four-particle cumulant method to further explore the multi-particle nature of correlations in pPb collisions. We observe a remarkable similarity in the $v_{3}$ signal as a function of multiplicity between pPb and PbPb systems.