Speaker
Description
In this talk, I will discuss recent progress in understanding
multiparticle correlations in small systems from an initial state model.
In this model of eikonal quarks scattering off of a dense nuclear target
with localized domains of color charge, we are able to reproduce many of
the qualitative features observed in light-heavy ion collisions at RHIC
and the LHC which are often ascribed to collective behavior. These
include the ordering of n-th moment two particle Fourier azimuthal
anisotropy coefficient, $v_n\{2\}$; a negative four particle second
Fourier cumulant $c_2\{4\}$, giving rise to a real $v_2\{4\}$; the
similarity for multiparticle second Fourier harmonics $v_2\{4\} \approx
v_2\{6\} \approx v_2\{8\}\$; and the energy dependence of the four
particle symmetric cumulants. I will also contrast this model with the
Glasma graph approximation, where some of these feature cannot be
reproduced, leading to the conclusion that multiple scattering is a key
ingredient for the observed multiparticle correlations from the initial
state.
