Hadron masses in cavity quantum chromodynamics to order ${\alpha }_s^2$

Abstract

The non-divergent diagrams describing two-gluon exchange and annihilation between quarks and antiquarks are calculated in the Feynman gauge, based on quantum chromodynamics in a spherical cavity. Using the experimental $N$, $\Delta$, $\Omega$, and $\rho$ masses to fit the free parameters of the M.I.T.\ bag model, the predicted states agree very well with the observed low-lying hadrons. As expected, the two-gluon annihilation graphs lift the degeneracy of the $\pi$ and $\eta$, while the $\rho$ and $\omega$ remain degenerate. Diagonalizing the $\eta -{\eta }^{\prime }$ subspace Hamiltonian yields a very good value for the mass of the $\eta$ meson.

Comments: 15 pages, 2 figures