Can collisional energy loss explain nuclear suppression factor for light   hadrons ?
  We argue that in the measured $p_T$ domain of RHIC, collisional rather than the radiative energy loss is the dominant mechanism for jet quenching. Accordingly we calculate nuclear suppression factor for light hadrons by taking only the elastic energy loss in sharp contrast with the previous calculations where only the radiative loss are considered. 
Jan-e Alam, Pradip Roy and Abhee K. Dutt-Mazumder