Energy 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)
It seems that parton
energy loss can explain
the data ... yet ...

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)