Study of Tetraquarks with a simple model
  Tetraquarks are studied with an approximation which reduces the in- ternal degrees of freedom of the system, using both finite differences and scattering theory. The existence of bound states and resonances is inspected and the masses and widths of the found resonances are calculated. 
Marco Cardoso, Pedro Bicudo, Nuno Cardoso
hep-ph hep-lat