2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/108704Quantum field model of unstable particles with random mass is suggested to describe the finite-width effects in decay rate. Within the framework of this model we derive the convolution formula for a width of the channels with unstable particle in a final state. The distribution function of random mass is considered for ustable particles of arbitrary type11 pages, added reference, changed contentHigh Energy Physics - Phenomenologytext