Entanglement entropy, entropy production and time evolution in high energy QCD

Understand

Working in the framework of the Color Glass Condensate effective theory of high energy QCD, we revisit the momentum space entanglement entropy of the soft gluons produced in high energy dilute-dense collisions.

• We extend the work of~\cite{Kovner:2015hga} by considering entropy produced in a single event.
• This entropy arises due to decoherence of eigenstates with different energies during the time evolution after the collisions with the target.
• We define it rigorously as the entanglement entropy of the produced system with the experimental apparatus.