ρ0 - vector meson elliptic flow (v2) in Au + Au collisions at sNN=200 GeV in STAR at RHIC

The first measurement of the ρ0 - vector meson elliptic flow v2 at mid-rapidity (|y| < 0.5) in 40−80 % centrality in Au + Au collisions at sNN=200 GeV from the STAR experiment at RHIC is presented. The study is through the π+π− hadronic decay channel of ρ0 which has a branching ratio of ∼ 100 %. The analysis is being carried out in two different methods. The v2 results obtained in these methods are consistent. Number of Constituent Quark (NCQ) scaling of v2 of ρ0 meson with respect to other hadrons at intermediate pT is observed. The ρ0v2 favors NCQ = 2 scaling, supporting the coalescence being the dominant mechanism of hadronization in the intermediate pT region at RHIC.