Rapidity dependence of pion elliptic flow

This paper shows the preliminary results on charged hadron and identified pion elliptic flow obtained by BRAHMS during the RHIC RUN 4 of AuAu at . It is shown that the dependence of the elliptic flow on transverse momentum is quite large at both mid- and forward rapidities. The pT differential v2 is found to have a very small dependence on pseudorapidity.