Quarkonium above deconfinement as an open quantum system

Abstract

Quarkonium at temperatures above deconfinement is an open quantum system, whose dynamics is determined not just by a potential energy and mass, but also by a drag coefficient which characterizes its interaction with the medium. We develop a path-integral Monte Carlo method for examining quarkonium at finite-temperature; first, the path-integral approach for open quantum systems is developed analytically for imaginary time, and then the imaginary-time Green function is calculated with a realistic potential, mass, and drag term for quarkonium near deconfinement. We demonstrate that dissipation could affect the Euclidean heavy-heavy correlation functions calculated in lattice simulations at temperatures just above deconfinement.