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arXiv 0912.5219hep-ph
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第四代轻子扇区

The Lepton Sector of a Fourth Generation

Gustavo Burdman, Leandro Da Rold, Ricardo D. Matheus

摘要:

在标准模型的扩展中,一个重要的问题是,是什么使第四代轻子扇区,特别是中微子,与较轻的三代轻子扇区如此不同。我们研究这个问题的上下文中的模型的电弱对称性破缺扭曲额外的维度,其中的味道层次结构所产生的本地化的零模式费米子在额外的维度。在这种设置中,希格斯扇区位于红外膜附近,而马约拉纳质量项位于紫外膜。因此,轻中微子几乎完全是马约拉纳粒子,而第四代中微子主要是狄拉克费米子。我们表明,它是可能的,以获得重的第四代轻子的参数空间的轻中微子的质量和混合是与观测兼容的区域。我们研究这些边界的影响,以及轻子味违反,这些模型的唯象。

英文摘要:

In extensions of the standard model with a heavy fourth generation one important question is what makes the fourth-generation lepton sector, particularly the neutrinos, so different from the lighter three generations. We study this question in the context of models of electroweak symmetry breaking in warped extra dimensions, where the flavor hierarchy is generated by the localization of the zero-mode fermions in the extra dimension. In this setup the Higgs sector is localized near the infrared brane, whereas the Majorana mass term is localized at the ultraviolet brane. As a result, light neutrinos are almost entirely Majorana particles, whereas the fourth generation neutrino is mostly a Dirac fermion. We show that it is possible to obtain heavy fourth-generation leptons in regions of parameter space where the light neutrino masses and mixings are compatible with observation. We study the impact of these bounds, as well as the ones from lepton flavor violation, on the phenomenology of these models.

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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