Gluon Spin in a Quark Model

Abstract

We compute the gluon polarization $\Delta G$ and the gluon total angular momentum $J_g$ in the Isgur-Karl quark model. Taking into account self-interaction contributions, we obtain for both quantities a positive value of about 0.24 at the model scale ${\mu }_0^2\simeq 0.25$ GeV${}^2$. This estimate is reasonably close to the expectation from polarized deep inelastic scattering analyses.

Comments: 8 pages, no figures, 1 table