“Jet quenching” models: parton en. loss + shadowing + Cronin = flat RAA

Initial state pT broadening provides: (1) the needed enhancement at intermediate pT , (2) the small decrease at higher pT so as to compensate for the pT dependence of energy loss and give the observed ~flat RAA (pT)

Initial state pT broadening provides: (1) the needed enhancement at intermediate pT , (2) the small decrease at higher pT so as to compensate for the pT dependence of energy loss and give the observed ~flat RAA (pT)