PHENIX results on collectivity in high-multiplicity p ＋ Au, d ＋ Au and ~3He ＋ Au collisions

摘要

We present recent PHENIX results for long-range two-particle correlation functions across a large pseudorapidity(η) gap in high-multiplicity p＋Au, d＋Au and ~3He＋Au collisions. Enhanced correlations are observed for particles with small azimuthal separation. Measurements of the second order Fourier coefficients (υ_2) in p/d/~3He＋Au collisions, and the third order Fourier coefficient (113) in ~3He＋Au collision are performed using the event plane method. Scaling of υ_2 with the initial eccentricity (￡2) is performed in each system to investigate the role of the initial geometry in the development of a final-state anisotropy in the particle emission. The υ_2 coefficients for identified π~± , K~± and (anti-)proton are measured as a function of transverse kinetic energy (KEt) and their magnitudes are found to scale approximately with the number of constituent quarks in the hadron.