2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45788The model for hybrid excitations of the QCD string with quarks is presented starting from the perturbation theory in the nonperturbative background. The propagation of a system containing $q \bar q$-pair and gluon is considered. The simplified version of the Hamiltonian, including both long-range nonperturbative interaction and Coulomb force, is derived. The masses of the lowest $q \bar q g$ hybrids are evaluated, and numerical results for the spectra are listed.Latex,16 pages,one figureHigh Energy Physics - PhenomenologyNuclear Theorytext