2021/11/11 by Haowu Duan, Alex Kovner, Vladimir V. Skokov
Physics and Astronomy · #Boson #Color-glass condensate #Cosmology and Gravitation Theories #Density matrix #Diagonal #Gluon #Hadron #High-Energy Particle Collisions Research #Massless particle #Mathematical physics #Matrix (chemical analysis) #Momentum (technical analysis) #Particle physics #Physics #Quantum #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum electrodynamics #Quantum entanglement #Quantum mechanics #hep-ph
paper · pdf · doi:10.1103/physrevd.105.056009
21 pages
arxiv created 2021/11/11 · openalex publication_date 2022/03/10 · arxiv updated 2022/03/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We revisit and extend the calculation of the density matrix and entanglement entropy of a Color Glass Condensate by including the leading saturation corrections in the calculation. We show that the density matrix is diagonal in the quasi particle basis, where it has the Boltzmann form. The quasi particles in a wide interval of momenta behave as massless two-dimensional bosons with the temperature proportional to the typical semi-hard scale T=Qs/√(αsNc). Thus the semi-hard momentum region Qs<k<Qs/√(αsNc) arises as a well-defined intermediate regime between the perturbatively hard momenta and the nonperturbative soft momenta k<Qs in the CGC description of a hadronic wave function.