Hadron resonances, large Nc, and the half-width rule
  We suggest using the half-width rule to make an estimate of the 1/Nc errors in hadronic models containing resonances. We show simple consequences ranging from the analysis of meson Regge trajectories, the hadron resonance gas at finite temperature and generalized hadronic form factors. 
Enrique Ruiz Arriola, Wojciech Broniowski, Pere Masjuan
hep-ph