TL;DR
This paper demonstrates that extending the fermion sector in flipped SU(5) models can naturally suppress proton decay from dimension-6 operators through fermion mixing angles.
Contribution
It introduces a simple fermion sector extension that allows arbitrary suppression of proton decay in flipped models.
Findings
Proton decay can be suppressed by fermion mixing angles.
The method is natural and does not require fine-tuning.
Applicable to flipped SU(5) and similar models.
Abstract
It is shown that by a simple extension of the fermion sector of flipped SU(5) models and other flipped models proton decay coming from dimension-6 operators can be suppressed by fermion mixing angles by an arbitrary amount in a natural way.
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