CANCELLATION OF LEADING DIVERGENCES IN THE LEFT-RIGHT ELECTROWEAK MODEL AND HEAVY-PARTICLES

The fine-tuning principles for estimating heavy-particle masses in the left-right-symmetric model are analyzed. The Veltman condition is mod ified on the basis of the hypothesis that fermion and boson vacuum ene rgies are compensated within the multiplets of the left-right model. T he hypothesis is supplemented with the requirement of stability under rescaling. On the basis of these requirements, it is shown that the ri ght-handed Majorana neutrinos with masses on the order of the mass of right-handed gauge bosons must exist, and the top-quark mass is estima ted. The resulting estimate is in good agreement with the experimental value.