A possible origin of the q=4/3 diquark
  Between the new physics candidates proposed to explain the $t \bar t$ asymmetry measured in the Tevatron, there are some scalar diquarks with electric charge +4/3. This kind of diquark is also needed to classify all the scalars of the supersymmetric standard model, with three generations, under a global flavour symmetry. 
Alejandro Rivero (BIFI, Universidad de Zaragoza)
hep-ph