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arXiv 1504.02780hep-ph
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一般扭曲额外维模型中的费米子质量和混合

Fermion Masses and Mixing in General Warped Extra Dimensional Models

Mariana Frank, Cherif Hamzaoui, Nima Pourtolami, Manuel Toharia

摘要:

我们分析了费米子质量和混合在一个一般的扭曲额外的维模型,其中所有的标准模型(SM)领域,包括希格斯粒子,被允许在大规模传播。在这种情况下,一个稍微打破的味道对称性普遍施加在所有的费米子场,没有区别,可以产生完整的味道结构的SM,包括夸克,带电轻子和中微子。对于夸克和带电轻子,它们的波函数对小的味破缺效应的指数敏感性产生了自然的分级质量和混合,就像在大体积费米子的翘曲模型中一样。在中微子部分,指数波函数因子可以是味盲的,因此对小味对称性破缺效应不敏感,直接将它们的质量和混合角与5D中微子汤川耦合的味对称结构联系起来。希格斯粒子必须局部化在散装和模型自然是更成功的广义翘曲的情况下,度量背景的解决方案是不同于$AdS_5$。我们在两个简单的框架中研究这些特征,风味互补和风味民主,它们提供了夸克和轻子之间的具体预测和相关性,随着中微子领域更精确的数据的出现,这些预测和相关性是可以检验的。

英文摘要:

We analyze fermion masses and mixing in a general warped extra dimensional model, where all the Standard Model (SM) fields, including the Higgs, are allowed to propagate in the bulk. In this context, a slightly broken flavor symmetry imposed universally on all fermion fields, without distinction, can generate the full flavor structure of the SM, including quarks, charged leptons and neutrinos. For quarks and charged leptons, the exponential sensitivity of their wave-functions to small flavor breaking effects yield naturally hierarchical masses and mixing as it is usual in warped models with fermions in the bulk. In the neutrino sector, the exponential wave-function factors can be flavor-blind and thus insensitive to the small flavor symmetry breaking effects, directly linking their masses and mixing angles to the flavor symmetric structure of the 5D neutrino Yukawa couplings. The Higgs must be localized in the bulk and the model is naturally more successful in generalized warped scenarios where the metric background solution is different than $AdS_5$. We study these features in two simple frameworks, flavor complimentarily, and flavor democracy, which provide specific predictions and correlations between quarks and leptons, testable as more precise data in the neutrino sector becomes available.

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