Cancellation of neutralΔS≠0hadronic processes without charmed particles

The S${\mathrm{U}}^2$⊗${\mathrm{U}}^1$ gauge model of weak and electromagnetic interactions introduced by Weinberg and Salam is extended to the group S${\mathrm{U}}^2$⊗${\mathrm{U}}^1$⊗${\mathrm{U}}^1$. A natural cancellation of the effective Lagrangian for neutral strangeness-changing semileptonic processes is achieved without using charmed quarks. The additional neutral vector boson may have an arbitrarily small mass.