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arXiv 1409.4052hep-ph
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具有离散对称的极小左右模型的生存性

Viability of minimal left-right models with discrete symmetries

Wouter Dekens, Daniel Boer

摘要:

我们提供了一个系统的研究最小的左右模型,$P$,$C$和/或$CP$变换下不变。由于高度的对称性,这种模型在$CP$破坏的数量和模式方面具有相当的预测性,它们可以在较低的能量下产生或容纳。使用目前的实验限制,一些模型已经可以排除在外。为了这个目的,我们提供了一个概述的实验约束不同的左右对称模型,考虑边界从碰撞机,介子混合和低能观测,如β衰变和电偶极矩。各种汤川和希格斯部门的功能进行了详细讨论。特别是,我们给希格斯势为每种情况下,讨论可能的真空和调查的微调量存在于这些潜力。事实证明,所有具有$P$、$C$和/或$CP$对称性的左右模型都具有高度的微调,除非补充了抑制某些参数的机制。在$P$和$C$下对称的模型与目前的观测结果不一致,而具有$P$、$C$或$CP$对称的模型还不能被数据排除。为了进一步限制和区分模型,在LHCb和$B$ -工厂测量$B$ -介子观测量将特别重要,而测量轻核的EDM特别是可以提供LRM的补充测试。

英文摘要:

We provide a systematic study of minimal left-right models that are invariant under $P$, $C$, and/or $CP$ transformations. Due to the high amount of symmetry such models are quite predictive in the amount and pattern of $CP$ violation they can produce or accommodate at lower energies. Using current experimental constraints some of the models can already be excluded. For this purpose we provide an overview of the experimental constraints on the different left-right symmetric models, considering bounds from colliders, meson-mixing and low-energy observables, such as beta decay and electric dipole moments. The features of the various Yukawa and Higgs sectors are discussed in detail. In particular, we give the Higgs potentials for each case, discuss the possible vacua and investigate the amount of fine-tuning present in these potentials. It turns out that all left-right models with $P$, $C$, and/or $CP$ symmetry have a high degree of fine-tuning, unless supplemented with mechanisms to suppress certain parameters. The models that are symmetric under both $P$ and $C$ are not in accordance with present observations, whereas the models with either $P$, $C$, or $CP$ symmetry can not be excluded by data yet. To further constrain and discriminate between the models measurements of $B$-meson observables at LHCb and $B$-factories will be especially important, while measurements of the EDMs of light nuclei in particular could provide complementary tests of the LRMs.

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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