Speaker
Description
We show how collectivity arises from a simple model of proton-nucleus collisions. The model consists of a projectile comprised of nearly collinear quarks coherently scattering off localized domains of color charge of a dense nuclear target.
We find that many of the features observed in light-heavy ion collisions at RHIC and the LHC often ascribed to collectivity are qualitatively reproduced. These include the ordering of the azimuthal Fourier harmonics of two-particle correlations; a negative four-particle cumulant giving rise to a real $v_2\{4\}$; and the energy and transverse momentum dependence of $v_2\{4\}$. An abelian version of the model exhibits a scaling of the two, four, six, and eight particle correlations, $v2\{2\} > v2\{4\} \approx v2\{6\} \approx v2\{8\}$, often interpreted as a signature of collectivity.
