Quenching of light hadrons at RHIC in a collisional energy loss scenario
  We evaluate the nuclear suppression factor, $R_{AA}(p_T)$ for light hadrons by taking into account the collisional energy loss. We show that in the measured $p_T$ domain of RHIC the elastic process is the dominant mechanism for the partonic energy loss. 
Pradip Roy, Jan-e Alam and Abhee K. Dutt-Mazumder