Azimuthal Harmonics in Small and Large Collision Systems at RHIC Top Energies. Academic Article uri icon


  • The first (v_{1}^{fluc}), second (v_{2}), and third (v_{3}) harmonic coefficients of the azimuthal particle distribution at midrapidity are extracted for charged hadrons and studied as a function of transverse momentum (p_{T}) and mean charged particle multiplicity density N_{ch} in U+U (sqrt[s_{NN}]=193GeV), Au+Au, Cu+Au, Cu+Cu, d+Au, and p+Au collisions at sqrt[s_{NN}]=200GeV with the STAR detector. For the same N_{ch}, the v_{1}^{fluc} and v_{3} coefficients are observed to be independent of the collision system, while v_{2} exhibits such a scaling only when normalized by the initial-state eccentricity (_{2}). The data also show that ln(v_{2}/_{2}) scales linearly with N_{ch}^{-1/3}. These measurements provide insight into initial-geometry fluctuations and the role of viscous hydrodynamic attenuation on v_{n} from small to large collision systems.

published proceedings

  • Phys Rev Lett

author list (cited authors)

  • Adam, J., Adamczyk, L., Adams, J. R., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., ... STAR Collaboration.

publication date

  • January 1, 2019 11:11 AM