Discrete symmetries and isosinglet quarks in low-energy supersymmetry

Details Discrete symmetries and isosinglet quarks in low-energy supersymmetry Discrete symmetries and isosinglet quarks in low-energy supersymmetry

1994-08-04

arxiv.org/abs/hep-ph/9408230v1

Phys.Lett. B340 (1994) 67-73

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, MIT-CTP-2345, NUB-3097-94TH

Scientific paper

10.1016/0370-2693(94)91299-8

Many extensions of the minimal supersymmetric standard model contain superfields for quarks which are singlets under weak isospin with electric charge -1/3. We explore the possibility that such isosinglet quarks have low or intermediate scale masses, but do not mediate rapid proton decay because of a discrete symmetry. By imposing the discrete gauge anomaly cancellation conditions, we show that the simplest way to achieve this is to extend the Z_3 "baryon parity" of Ibanez and Ross to the isosinglet quark superfields. This can be done in three distinct ways. This strategy is not consistent with grand unification with a simple gauge group, but may find a natural place in superstring-inspired models, for example. An interesting feature of this scenario is that proton decay is absolutely forbidden.

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