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arXiv 1303.2645hep-ph
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θ(13)和“扭曲”A(4)模型中的荷电轻子味破坏

Theta(13) and charged Lepton Flavor Violation in "warped" A(4) models

Avihay Kadosh

摘要:

我们最近提出了一个在扭曲的额外维度中实现的自发的A $_{4}$味对称性破缺方案来解释夸克和轻子质量和混合的观测模式。这一选择的主要特点是解释费米子质量层次的波函数重叠,出现的tribimaxial(TBM)中微子混合和零夸克混合的领导秩序和没有树级规范介导的味道违反。夸克混合和偏离TBM中微子混合是由大量A $_4$黄子的存在引起的,它允许夸克和中微子扇区之间的“跨膜”相互作用和“串扰”。在这项工作中,我们研究的约束条件与最近的测量$θ_{13}\approx 9^\circ$的RENO和大亚湾,迫使每一个模型,预测隧道掘进机中微子混合,以占显着偏差的$θ_{13}$从0,同时保持$θ_{12}$和$θ_{23}$的值接近其中心的实验值。然后,我们继续详细研究的RS-A $_4$的贡献$μ\to e,3e$,在树的水平上产生的凭借异常$Z$耦合。这些耦合产生于电弱对称破缺后的规范和费米子KK混合效应。由于$BR(μ\to e,3e)$的实验灵敏度预计在未来十年内将增加五个数量级,它表明,RS-A $_4$轻子扇区可以显着约束。最后,我们表明,当“跨膜”的相互作用被关闭,$Z$耦合被保护对所有异常的贡献和$θ_{13}$和$θ_{23}$的最大偏差之间的强相关性被发现。

英文摘要:

We recently proposed a spontaneous A$_{4}$ flavor symmetry breaking scheme implemented in a warped extra dimensional setup to explain the observed pattern of quark and lepton masses and mixings. The main features of this choice are the explanation of fermion mass hierarchies by wave function overlaps, the emergence of tribimaximal (TBM) neutrino mixing and zero quark mixing at the leading order and the absence of tree-level gauge mediated flavor violation. Quark mixing and deviations from TBM neutrino mixing are induced by the presence of bulk A$_4$ flavons, which allow for "cross-brane" interactions and a "cross-talk" between the quark and neutrino sectors. In this work, we study the constraints associated with the recent measurements of $θ_{13}\approx 9^\circ$ by RENO and Daya Bay, forcing every model that predicts TBM neutrino mixing to account for the significant deviation of $θ_{13}$ from 0, while keeping the values of $θ_{12}$ and $θ_{23}$ close to their central experimental values. We then proceed to study in detail the RS-A$_4$ contributions to $μ\to e,3e$, generated at the tree level by virtue of anomalous $Z$ couplings. These couplings arise from gauge and fermionic KK mixing effects after electroweak symmetry breaking. Since the experimental sensitivity for $BR(μ\to e,3e)$ is expected to increase by five orders of magnitude within the next decade, it is shown that the RS-A$_4$ lepton sector can be significantly constrained. Finally, we show that when "cross-brane" interactions are turned off, the $Z$ couplings are protected against all anomalous contributions and a strong correlation between $θ_{13}$ and the deviation from maximality of $θ_{23}$ is found.

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