Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-07-24
Phys.Rev.Lett. 84 (2000) 5269-5272
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, Revtex
Scientific paper
10.1103/PhysRevLett.84.5269
In the standard model the proton is protected from decay naturally by gauge symmetries, whereas in the ordinary minimal supersymmetric standard model an ad hoc discrete symmetry is imposed for the proton stability. We present a new supersymmetric model in which the proton decay is forbidden by an extra U(1) gauge symmetry. Particle contents are necessarily increased to be free from anomalies, incorporating right-handed neutrinos. Both Dirac and Majorana masses are generated for neutrinos, yielding non-vanishing but small masses. The superpotential consists only of trilinear couplings and the mass parameter $\mu$ of the minimal model is induced by spontaneous breaking of the U(1) symmetry.
Aoki Mayumi
Oshimo Noriyuki
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