Abstract:
Spin–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.
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