2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/23321We consider directed percolation processes for particle types A and B coupled unidirectionally by a transmutation reaction A -> B. It is shown that the strong coupling regime of this recently introduced problem defines a universality class with upper critical dimension d=6. Exact expressions are derived for the scaling dimensions in the inactive phase above d=4. Below d=4 the interactions of the normal directed percolation also get relevant.6 pages, 1 figureSoft Condensed Mattertext