2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/82622The running of the $ρ\bar N N$ couplings in presence of nuclear matter is studied, and the relevant $β$-functions are shown to be different for $ρ^0$ and $ρ^+$, when the nuclear medium is asymmetric.Plain LaTeX file of the paper and postscript file of the figuresNuclear Theorytext