Measurements of identified particle anisotropic flow in Cu + Au and U + U collisions by PHENIX experiment

In this paper, new measurements of anisotropic flow image for identified particles such as pions and protons in Cu + Au collisions at image and U + U collisions at image are reported. The anisotropic flow is studied as a function of image and centrality in these two collision systems. In ultra-central U + U collisions (0–2% centrality), image of protons shows a weak image dependence for image. A positive image for charged pions is observed for image with respect to the first-order event plane, the angle of which is determined by the Au-going spectators. The scaling of identified particle image with the number of valence quarks image has been observed in these two collision systems, with the transverse kinetic energy.