Perturbative high-energy evolution in the IP-Glasma initial state

¹ Department of Physics, University of Jyväskylä, P.O. Box 35, 40014 University of Jyväskylä, Finland
² Helsinki Institute of Physics, P.O. Box 64, 00014 University of Helsinki, Finland
³ Physics Department, Brookhaven National Laboratory, Upton, NY 11973, USA
⁴ Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA
⁵ Physics Department, University of California, Berkeley, California 94720, USA
⁶ Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

^* e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Published online: 17 April 2026

Abstract

We include the perturbative JIMWLK energy evolution into the IP-Glasma initial state description used to simulate the early-time dynamics in heavy ion collisions. By numerically solving the JIMWLK equation on an event-by-event basis, we obtain the energy (Bjorken-x) dependent structure of the colliding nuclei. Combining the initial state with hydrodynamic simulations, this enables us to predict how observables evolve when moving from RHIC to LHC energies.