Large transverse momentum suppression of $\pi^0$'s in Au+Au and d+Au   collisions at $\sqrt{s}=200$ GeV
  We propose a model of suppression of $\pi^0$'s based on two different effects: at low $p_T$ we take into account the shadowing corrections, while at large $p_T$ the suppression is produced due to the interaction of the large $p_T$ pion with the dense medium created in the collision. The main features of the data on $AuAu$ and $dAu$ collisions are reproduced both at mid and at forward rapidities. 
A. Capella, E. G. Ferreiro, A. B. Kaidalov, D. Sousa