Tunneling through Color Glass Condensate and True Black Disks

TL;DR

This paper advances the understanding of the color glass condensate by discovering new solutions, improving the model with a density matrix, and analyzing black disk formation, revealing the necessity of quarks and nonvacuum loops.

Contribution

It introduces new vacuum solutions of the JIMWLK equation, enhances the CGC model with a density matrix, and characterizes the true black disk wave function with quark content.

Findings

New vacuum solutions of the JIMWLK equation corresponding to gauge group centers

CGC amplitude expressed via group characters in external fields

True black disk wave function necessarily contains many quarks

Abstract

We discover new vacuum solutions of the JIMWLK equation, which correspond to center of a gauge group. We improve the color glass condensate (CGC) model by an explicit usage of a density matrix. Studying scattering of CGC states in an external color field, we observe that an amplitude is naturally expressed via group characters. We construct an example that shows how new thin effects may be potentially observed in peripheral collisions. We prove that at any parton density a gluonic CGC state does not become a true black disk. We find a wave function of a true black disk and show that it necessarily contains many quarks. This result corresponds to the necessity of nonvacuum Reggeon loops in a formation of a true black disk.