Abstract

We recently introduced new concepts, implemented in EPOS4, which allows us to consistently accommodate factorization and saturation in high-energy proton-proton and nucleus-nucleus collisions in a rigorous parallel scattering framework. EPOS4 has a modular structure and in this paper, we present in detail how the "single scattering module"(the main EPOS4 building block) is related to perturbative QCD and how these calculations are performed, with particular care being devoted to heavy flavor contributions. We discuss similarities and differences compared to the usual pQCD approach based on factorization.