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Hierarchy of azimuthal anisotropy harmonics in collisions of small systems from the Color Glass Condensate
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abstract
We demonstrate that the striking systematics of two-particle azimuthal Fourier harmonics $v_2$ and $v_3$ in ultrarelativistic collisions of protons, deuterons and helium-3 ions off gold nuclei measured by the PHENIX Collaboration [arXiv:1805.02973] at the Relativistic Heavy Ion Collider (RHIC) is reproduced in the Color Glass Condensate (CGC) effective field theory. This contradicts the claim in [arXiv:1805.02973] that their data rules out initial state based explanations. The underlying systematics of the effect, as discussed previously in [arXiv:1705.00745,arXiv:1706.06260,arXiv:1801.09704], arise from the differing structure of strong color correlations between gluon domains of size $1/Q_S$ at fine ($p_\perp \gtrapprox Q_S$) or coarser ($p_\perp \lessapprox Q_S$) transverse momentum resolution. Further tests of the limits of validity of this framework can be carried out in light-heavy ion collisions at both RHIC and the Large Hadron Collider. Such measurements also offer novel opportunities for further exploration of the role of the surprisingly large short-range nuclear correlations measured at Jefferson Lab.
Forward citations
Cited by 4 Pith papers
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Hydrodynamic attractors, initial state energy and particle production in relativistic nuclear collisions
A hydrodynamic-attractor relation between initial-state energy and final charged-particle multiplicity explains the centrality dependence of yields and lets the authors estimate pre-equilibrium energy densities.
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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.
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Elliptic and triangular flows in dAu collisions at 200 GeV in the fusing color string model
The fusing color string model, calibrated to Pb-Pb with one quenching coefficient, reproduces the d-Au over p-Au ordering of v2 at 200 GeV but predicts too much triangular flow.
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Effective theories for nuclei at high energies
This paper reviews the Color Glass Condensate effective theory, covering its foundations, its role in deep inelastic scattering, and its use in setting initial conditions for heavy-ion collisions.
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