A quark-diquark baryon model
  A simple quark-diquark model for the baryons is constructed as a partial solution to the well known missing resonances problem. A complete classification of the baryonic states in the quark-diquark framework is given and the spectrum is calculated through a mass formula built to reproduce the rotational and vibrational Regge trajectories. 
Elena Santopinto, Giuseppe Galat\`a
hep-ph