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arXiv 2108.09316hep-ph
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大统一中质子稳定性的途径

Paths to proton stability in grand unification

Lisa L. Everett, Oleg Popov

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5 pages, 4 tables
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摘要：

我们探讨大统一的情况下，质子衰变可以被抑制，并可能消除由于新的嵌入的标准模型物质场到大统一群和剩余对称性的不可约表示。该方案是基于一个$SU(7)$规范群，其中的物质场被嵌入在一个无异常的字段，可以实现为一个自然的子群的基本旋量表示的$SO(14)$规范对称性。根据嵌入的不同，质子衰变可以在树的水平上被禁止，并通过单圈图产生，或者质子可以通过强迫它进入必须有偶数个轻子的衰变通道而变得稳定，而与理论的玻色子内容无关。我们描述的理论和现象学的影响，这种情况下，包括它们的影响暗物质和中微子质量。

英文摘要：

We explore scenarios within grand unification in which proton decay can be suppressed and possibly eliminated due to novel embeddings of the Standard Model matter fields into irreducible representations of the grand unified group and residual symmetries. The scenarios are based on an $SU(7)$ gauge group, in which the matter fields are embedded within an anomaly-free set of fields that can be realized as a natural subgroup of the fundamental spinor representation of an $SO(14)$ gauge symmetry. Depending on the embedding, proton decay can either be forbidden at tree level and generated via one-loop diagrams, or the proton can be made stable by forcing it to decay channels that must have an even number of leptons, independently of the bosonic content of the theory. We describe the theoretical and phenomenological implications of such scenarios, including their implications for dark matter and neutrino masses.

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