Probe charm quark dynamics via multiparticle azimuthal correlations in PbPb collisions at 5.02TeV with the CMS detector*

The anisotropy at the final state of the expansion of the quark-gluon plasma (QGP) in relativistic heavy ion collisions originates from the initial eccentric collision geometry. And it is characterized by the so-called elliptic flow. Besides the hydrodynamic evolution, the energy loss during particles traversing through QGP also has an impact on the elliptic flow. The event-by-event fluctuations of initial geometry and energy loss lead to the variations of elliptic flow at the final state. Measuring fluctuations of elliptic flow will provide insights into dynamics inside QGP. Charm quarks are mostly created at the initial stage of collisions because of their large masses. Recent measurements at the LHC show that they are strongly coupled with QGP. Thus they are perfect probes to both initial geometry of collisions and the inner workings of the quark-gluon plasma. In this contribution, the elliptic flow of neutral D meson (consisting of a charm quark) using 2- and 4-particle technique will be presented. And the fluctuations of the elliptic flow of neutral D meson will also be compared with charged particles in the same kinematic range.