Looking for Delta I = 5/2 amplitude components in B -> pi pi and B ->   rho rho experiments
  We discuss how experiments measuring B -> pi pi and B -> rho rho may be used to search for a Delta I = 5/2 amplitude component. This component could be the explanation for a recent (albeit very tentative) hint from B(Bbar) -> rho rho decays that the isospin triangles do not close. 
F. J. Botella, David London and Joao P. Silva