2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/217891Spin-dependent interaction in hadrons is considered in the approach of the QCD string. The string moment of inertia, which ensures the correct (inverse) Regge slope 2*pi*sigma, is found to suppress the spin-orbit interaction. For light quarks and moderate angular momenta the suppression constitutes around 25% whereas for large angular momenta the spin-orbit interaction is suppressed by the factor L^(-2/5). For heavy quarks the effect manifests itself as a string correction for the spin-dependent potential.LaTeX2e, 6 pages, uses jetpl.cls, version to appear in JETP LettHigh Energy Physics - Phenomenologytext