Alternative ansatz to wounded nucleon and binary collision scaling in high-energy nuclear collisions

We introduce a new parametric initial-condition model for high-energy nuclear collisions based on eikonal entropy deposition via a ``reduced-thickness'' function. The model simultaneously describes experimental proton-proton, proton-nucleus, and nucleus-nucleus multiplicity distributions and generates nucleus-nucleus eccentricity harmonics consistent with experimental flow constraints. In addition, the model is compatible with ultracentral uranium-uranium data unlike existing models that include binary collision terms.