MC-EKRT: Monte Carlo event generator with saturated minijet production for initializing 3+1 D fluid dynamics in high energy nuclear collisions

TL;DR

This paper introduces MC-EKRT, a Monte Carlo event generator that models initial states in high-energy nuclear collisions with detailed fluctuations and conservation laws, improving the realism of 3+1D fluid dynamic simulations.

Contribution

It presents a novel Monte Carlo implementation of the EKRT model incorporating saturation, fluctuations, and conservation laws for more accurate initial state modeling.

Findings

Provides full 3D event-by-event initial states

Includes fluctuating nuclear parton distribution functions

Accounts for energy-momentum and valence-quark conservation

Abstract

We present a novel saturation and leading order collinear factorization based Monte-Carlo implementation of the EKRT model for computing QCD matter initial states in high-energy nuclear collisions. As new features the MC implementation gives a full 3-dimensional initial state event-by-event, introduces new event-by-event fluctuating spatially dependent nuclear parton distribution functions, includes dynamical fluctuations in minijet production and saturation, and accounts for the energy-momentum and valence-quark number conservation.