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The McDIPPER: A novel saturation-based 3+1D initial state model for Heavy Ion Collisions
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abstract
We present a new 3D resolved model for the initial state of ultrarelativistic heavy-ion collisions, based on the $k_\perp$-factorized Color Glass Condensate hybrid approach. The McDIPPER framework responds to the need for a rapidity-resolved initial-state Monte Carlo event generator which can deposit the relevant conserved charges (energy, charge and baryon densities) both in the midrapidity and forward/backward regions of the collision. This event-by-event generator computes the gluon and (anti-) quark phase-space densities using the IP-Sat model, from where the relevant conserved charges can be computed directly. In the present work we have included the leading order contributions to the light flavor parton densities. As a feature, the model can be systematically improved in the future by adding next-to-leading order calculations (in the CGC hybrid framework), and extended to lower energies by including sub-eikonal corrections the channels included. We present relevant observables, such as the eccentricities and flow decorrelation, as tests of this new approach.
Forward citations
Cited by 4 Pith papers
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Analytic and Approximate Solutions to Color Glass Condensate in the Classical Weak-Field Limit
In the weak-field CGC limit the glasma energy-momentum tensor has universal late-time scaling ε,PT∼1/τ and PL∼1/τ³, with closed Meijer-G forms in the MV model and controlled series in an improved Gaussian model.
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Saturation effects in exclusive vector meson production in DIS
A dense-limit CGC hotspot calculation shows saturation mildly suppresses exclusive vector meson cross sections in ep, with suppression growing at higher color-charge density.
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Initial-State Charge Density Predicts Final-State Net Charge Flow in Heavy-Ion Collisions
Initial baryon density, through a charge-odd cumulant estimator with a fitted coupling, predicts final net-proton elliptic flow in event-by-event hydrodynamic simulations.
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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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