2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/173424Experimental and theoretical progress concerning the rare decay pi0 to e+e- is briefly reviewed. It includes the latest data from KTeV and a new model independent estimate of the decay branching which show the deviation between experiment and theory at the level of 3.3σ.5 pages, 3 figures, talk at Int. Workshop on e+e- collisions from Phi to Psi, 7-10 April 2008, Frascati, ItalyHigh Energy Physics - Phenomenologytext