Dynamical suppression of the spin-orbit interaction in hadrons

TL;DR

This paper investigates how the inertia of the QCD string suppresses spin-orbit interactions in hadrons, revealing significant suppression effects for light and heavy quarks across different angular momenta.

Contribution

It introduces a novel approach using the string moment of inertia to explain the suppression of spin-orbit interactions in hadrons within the QCD string framework.

Findings

Spin-orbit interaction is suppressed by about 25% for light quarks at moderate angular momenta.

For large angular momenta, suppression scales as L^(-2/5).

String effects act as corrections to the spin-dependent potential in heavy quark systems.

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.