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The standard model seeming at a loss to account for the present experimentalaverage rate for the rare decay K+ -> Pi+ neutrino antineutrino, I tackle thequestion with the extension of the Glashow-Salam-Weinberg model to an SU(2)leftx U(1) gauge theory of J=0 mesons proposed by the author in [Phys. Lett. B 385(1996) 198], in which, in addition, the neutrinos are given Dirac masses fromYukawa couplings to the Higgs boson. The latter triggers a new contribution tothis decay through flavor changing neutral currents that arise in the quarticterm of the symmetry breaking potential; it becomes sizeable for a neutrinomass in the $MeV$ range; the experimental upper limit for the decay ratetranslates into an upper bound of 5.5 MeV for the mass of the neutrino, threetimes lower than present direct bounds.Comment: 7 pages LaTeX, 2 postscript figures + 1 logo (epsfig). The discussion  about the see-saw mechanism has been modified. Version to appear in Mod.  Phys. Lett.

EXTENDING THE STANDARD MODEL: AN UPPER BOUND FOR A NEUTRINO MASS FROM THE RARE DECAY $K^+\rightarrow\pi^+\nu\bar\nu$