2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/192354Critical examination is made on the relation between the mass shift of vector mesons in nuclear medium and the vector-meson $-$ nucleon scattering length. We give detailed comparison between the QCD sum rule approach by two of the present authors (Phys. Rev. {\bf C46} (1992) R34) and the scattering-length approach by Koike (Phys. Rev. {\bf C51} (1995) 1488). It is shown that the latter approach is mortally flawed both technically and conceptually.16 pages, latex, 4 figures appended as uu-encoded fileNuclear TheoryHigh Energy Physics - Phenomenologytext