2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49744We perform a detailed investigation of total lifetimes for the doubly heavy baryons $Ξ_{QQ'}$, $Ω_{QQ'}$ in the framework of operator product expansion over the inverse heavy quark mass, whereas, to estimate matrix elements of operators obtained in OPE, approximations of nonrelativistic QCD are used.21 pages, 9 figuresHigh Energy Physics - Phenomenologytext