A hybrid IP-Glasma and hydrodynamics calculation finds that final-state interactions are required for the RHIC small-system flow data, while the initial CGC momentum anisotropy contributes visibly at low multiplicity.
Anisotropy of the semi-classical gluon field of a large nucleus at high energy
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abstract
The McLerran-Venugopalan model describes a highly boosted hadron/nucleus as a sheet of random color charges which source soft classical Weizs\"acker-Williams gluon fields. We show that due to fluctuations, individual configurations are azimuthally anisotropic. We present initial evidence that impact parameter dependent small-x JIMWLK resummation preserves such anisotropies over several units of rapidity. Finally, we compute the first four azimuthal Fourier amplitudes of the S-matrix of a fundamental dipole in such background fields.
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Hybrid Color Glass Condensate and hydrodynamic description of the Relativistic Heavy Ion Collider small system scan
A hybrid IP-Glasma and hydrodynamics calculation finds that final-state interactions are required for the RHIC small-system flow data, while the initial CGC momentum anisotropy contributes visibly at low multiplicity.