2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/142505The Lorentz nature of confinement in a heavy-light quarkonium is investigated. It is demonstrated that an effective scalar interaction is generated selfconsistently as a result of chiral symmetry breaking, and this effective scalar interaction is responsible for the QCD string formation between the quark and the antiquark.4 pages, no figures, specialized style files included. Talk given at 13th Lomonosov Conference on Elementary Particle Physics, Moscow, Russia, 23-29 August 2007, to appear in ProceedingsHigh Energy Physics - Phenomenologytext