2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/214720We study the change in free and internal energy due to the presence of a heavy quark anti-quark pair in a thermal heat bath in QCD with 2-flavors of staggered quarks at finite temperature. We discuss string breaking below as well as screening above the transition. Similarities and differences to the quenched case are discussed.Talk by O.Kaczmarek at Hard Probes 2004, International Conference on Hard and Electromagnetic Probes of High Energy Nuclear Collisions, Nov. 4-10, 2004, Ericeira, Portugal, 4 pages, 5 figures, references correctedHigh Energy Physics - LatticeHigh Energy Physics - Phenomenologytext