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arXiv 2006.08616hep-ph
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Weinberg维5类矢量轻子偶算符

Weinberg dimension-5 operator by vector-like lepton doublets

Pei-Hong Gu

摘要:

众所周知,小中微子质量的Weinberg维5算符可以在三种类型的重整化模型中实现:(i)费米子单态介导的I型跷跷板,(ii)希格斯三态介导的II型跷跷板,(iii)费米子三态介导的III型跷跷板。本文指出,这种算符也可以由与非寻常费米子单线态、希格斯三线态或费米子三线态相关联的类矢量轻子二重态在树水平上诱导出来。如果这些异常的费米子单线态、希格斯三线态或费米子三线态足够重,它们的衰变可以产生轻子不对称性来解释宇宙重子不对称性,同时,矢量轻子二重态可以导致一种新的反向或线性跷跷板,具有丰富的可观测现象。我们进一步指定我们的情况下,可以自然地嵌入到一个大统一理论没有传统的I型,II型或III型跷跷板。

英文摘要:

It is well known that a Weinberg dimension-5 operator for small neutrino masses can be realized at tree level in three types of renormalizable models: (i) the type-I seesaw mediated by fermion singlets, (ii) the type-II seesaw mediated by Higgs triplets, (iii) the type-III seesaw mediated by fermion triplets. We here point out such operator can be also induced at tree level by vector-like lepton doublets in association with unusual fermion singlets, Higgs triplets or fermion triplets. If these unusual fermion singlets, Higgs triplets or fermion triplets are heavy enough, their decays can generate a lepton asymmetry to explain the cosmic baryon asymmetry, meanwhile, the vector-like lepton doublets can lead to a novel inverse or linear seesaw with rich observable phenomena. We further specify our scenario can be naturally embedded into a grand unification theory without the conventional type-I, type-II or type-III seesaw.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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