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arXiv 1303.6324hep-ph
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具有大的左右混合的TeV-scale左右对称理论中的轻子数和味破坏

Lepton number and flavour violation in TeV-scale left-right symmetric theories with large left-right mixing

James Barry, Werner Rodejohann

摘要:

在左右对称模型中,导致无中微子双β衰变的各种图具有不同的相对大小,这取决于新物理的尺度。中微子从I型和/或II型跷跷板项获得质量,使得明确的分析变得困难。我们研究了双β衰变在II型和I型显性情况下的半衰期,在前一种情况下,包括干扰项。如果I型跷跷板模型的重中微子在TeV量级,某些过程可以得到增强。特别是,在参数空间的某些区域,所谓的λ-和η-图可以对衰变的半衰期做出相当大的贡献。我们进行了详细的研究,这样的情况下,注意从轻子味违反的约束。

英文摘要:

The various diagrams leading to neutrinoless double beta decay in the left-right symmetric model have different relative magnitudes, depending on the scale of new physics. Neutrinos acquire mass from both type I and/or type II seesaw terms, making an unambiguous analysis difficult. We study the half-life for double beta decay in the case of type II and type I dominance, in the former case including interference terms. If the heavy neutrinos of the type I seesaw model are at the TeV scale, certain processes can be enhanced. In particular, there are regions of parameter space in which the so-called lambda- and eta-diagrams can give sizable contributions to the half-life for the decay. We perform a detailed study of one such scenario, paying careful attention to constraints from lepton flavour violation.

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