Speaker
Description
The small-system collisions (p/d/He+A) became of great interest since the finding of the flow of the particles which had been considered as a strong signature of the QGP production. On the hard and EM probes side, those that have been measured to characterize the QGP, such as Jets (or high pT hadrons), heavy flavor hadrons, and direct/thermal photons, have also been measured in the small system collisions. One interesting result on the direct photons showed that their yields scale with the dN/dy to the power of 1.2, from the large systems down to the central collisions in the small systems. The measurement of identified hadrons over wide range of pT from small to large systems is one of the promising tools to shed light on particle production in both soft and hard sectors, which cross-checks and helps to understand results coming from hard and EM processes. In this presentation, identified charged-hadron invariant pT and mT spectra, nuclear-modification factors and particle ratios, in p + Al, 3He +Au, and Cu + Au collisions at sqrt(s_NN) = 200 GeV and in U+U collisions at sqrt(s_NN) = 193 GeV measured by PHENIX are shown. And the physics interpretations including collective flow aspects for those measurement are presented. The values of freeze-out temperatures and average collective velocities have been obtained. It should also be noted that v2 flow values and pi0 productions in those various collision systems, have been measured by the PHENIX.
| Category | Experiment |
|---|---|
| Collaboration | PHENIX |
