Lepton Parity in Supersymmetric Flavor Models

Details Lepton Parity in Supersymmetric Flavor Models Lepton Parity in Supersymmetric Flavor Models

1999-04-28

arxiv.org/abs/hep-ph/9904473v1

JHEP 9906 (1999) 024

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, harvmac

Scientific paper

10.1088/1126-6708/1999/06/024

We investigate supersymmetric models where neither R-parity nor lepton number nor baryon number is imposed. The full high energy theory has an exact horizontal U(1) symmetry that is spontaneously broken. Quarks and Higgs fields carry integer horizontal charges but leptons carry half integer charges. Consequently, the effective low energy theory has two special features: a U(1) symmetry that is explicitly broken by a small parameter, leading to selection rules, and an exact residual Z_2 symmetry, that is lepton parity. As concerns neutrino parameters, the Z_2 symmetry forbids contributions from R_p-violating couplings and the U(1) symmetry induces the required hierarchy. As concerns baryon number violation, the Z_2 symmetry forbids proton decay and the U(1) symmetry provides sufficient suppression of double nucleon decay and of neutron - antineutron oscillations.

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