Azimuthal anisotropy measurements by STAR

The recent study of centrality and transverse momentum (pTpT) dependence of inclusive charged hardron elliptic anisotropy (v2v2) at midrapidity (|η|<1.0|η|<1.0) in Au+Au collision at sNN=7.7,11.5,19.6,27, and39 GeV in STAR Beam Energy Scan program is presented. We show that the observed increase of inclusive v2v2 is mainly due to the average pTpT increase with energy. In Au+Au 200 GeV collisions, the triangular anisotropy (v3v3) measurements highly depend on measurement methods; v3v3 is strongly dependent on Δη  . The difference between two- and four-particle cumulants v2{2}v2{2} and v2{4}v2{4} for Au+Au and Cu+Cu collision at sNN=62.4 and 200 GeV is used to explore flow fluctuations. Furthermore, by exploiting the symmetry of average flow in pseudorapidity η about midrapidity, the Δη  -dependent and independent components are separated using v2{2}v2{2} and v2{4}v2{4}.