A unified description of small, peripheral, and large system suppression data from pQCD

We present quantitative predictions for the nuclear modification factor in both small and peripheral systems from a pQCD-based energy loss model that is constrained by light- and heavy-flavor suppression data from central heavy-ion collisions. We find nearly identical suppression for central p / d + A collisions as for peripheral A + A collisions, quantitatively consistent with the measured 20% suppression of neutral pions produced in d + Au collisions by PHENIX, but dramatically inconsistent with the measured 20% enhancement of charged hadrons produced in p + Pb collisions by ATLAS. We demonstrate that this equivalence of central small system suppression and peripheral large system suppression is insensitive to the underlying energy loss model.