Speaker
Description
Small system (p+p, p+A, d/He+A) collisions at RHIC and LHC
exhibit interesting azimuthal anisotropies, with explanations varying
from geometry coupled to final state interactions to glasma diagrams to
color recombination. The PHENIX experiment has extended many of these
observables, including multi-particle cumulants, to lower energies with
the d+Au beam energy scan at 19.6, 39.0, 62.4, and 200 GeV. We present
new results on v2 anisotropies as a function of transverse momentum and
pseudorapidity and for various centrality selections. We compare the
results with calculations within the framework of viscous hydrodynamics
and parton scattering models (with and without final state
interactions). We present new results on multi-particle cumulants from
the d+Au beam energy scan at 19.6, 39.0, 62.4, and 200 GeV. All energies
result in real valued v_2{4}, in contrast to p+Au collisions at 200 GeV
where the v_2{4} is imaginary.
