2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/192269The $q^2$ dependence of the $ρ-ω$ mixing amplitude is analyzed with the use of the QCD sum rules and the dispersion relation. Going off shell the mixing decreases, changes sign at $q^2 \simeq 0.4 m_ρ^2 > 0$ and is negative in the space like region. Implications of this result to the isospin breaking part of the nuclear force are discussed.26 pages + 11 figures (PostScript)Nuclear TheoryHigh Energy Physics - Phenomenologytext