Exact Symmetries and Threshold States in Two-Dimensional Models for QCD

Understand

Two-dimensional SU$(N)$ gauge theory coupled to a Majorana fermion in the adjoint representation is a nice toy model for higher-dimensional gauge dynamics.

• It possesses a multitude of "gluinoball" bound states whose spectrum has been studied using numerical diagonalizations of the light-cone Hamiltonian.
• We extend this model by coupling it to $N_f$ flavors of fundamental Dirac fermions (quarks).
• The extended model also contains meson-like bound states, both bosonic and fermionic, which in the large-$N$ limit decouple from the gluinoballs.