Abstract
Collisions of small systems exhibit evidence of collective behavior through various flow type measurements, which suggests that quark gluon plasma could be produced in these collisions. If so, there could also be evidence for energy loss in the plasma, which would present itself in the spectra of hadrons. Accordingly, the study of hadron production in highly asymmetric small systems may help to understand the role of initial and final state effects in the relativistic ion collisions. Therefore, PHENIX has studied the nuclear modification factors of various hadron species (π0, ϕ, and h±) as a function of transverse momentum, rapidity, system size in p+Al, p+Au, d+Au, and 3He+Au collisions at sNN=200GeV. Scaling of hadron production in small systems with Ncoll or Ncoll/Nprojpart and a hint of jet quenching in nuclear modification factors of π0 were observed.
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