Custodial nonabelian gauge symmetries in realistic superstring derived models

Details Custodial nonabelian gauge symmetries in realistic superstring derived models Custodial nonabelian gauge symmetries in realistic superstring derived models

1994-08-21

arxiv.org/abs/hep-ph/9408333v1

Phys.Lett. B339 (1994) 223-231

Physics

High Energy Physics

High Energy Physics - Phenomenology

IASSNS--HEP--94/64, 16 pages, phyzzx

Scientific paper

10.1016/0370-2693(94)90636-X

A well known problem in supersymmetric models is the presence of, lepton and baryon number violating, dimension four operators. The traditional R parity solution may not be suitable if one tries to incorporate supersymmetry into a Planck scale theory. I propose a different solution in the context of realistic string models. I show that realistic string models can give rise to custodial nonabelian gauge symmetries under which only the leptons or quarks transform. I explain how such symmetries arise in a class of free fermionic models that are based on $Z_2\times Z_2$ orbifold with standard embedding. The custodial symmetries forbid proton decay from dimension four operators while allowing R parity violation.

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