Abstract
The baryon and lepton violation process ( A, Z) → ( A − 2, Z − 2) + e + + e + is investigated within the framework of two gauge models recently proposed. One is an SU L(2) × U(1) × SU C(3) model extended to include two isospin triplets which couple to quarks and leptons. The second is an extension of the minimal GUT SU(5) model to include a 45-plet and a 50-plet of Higgs scalars. With a reasonable choice of the parameters of these models and a proper treatment of nuclear physics, mean lifetimes of 10 33 yr may be expected.
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