T parity and the littlest Higgs
T parity and the littlest Higgs
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DOI：
10.1088/1126-6708/2004/10/067
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发表时间：
2004-09
影响因子：
5.4
通讯作者：
I. Low
中科院分区：
文献类型：
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作者：
I. Low
我们构造了最小希格斯模型的t宇称不变扩展，其中只使用了全对称群的线性表示，而不依赖于Coleman， Callan， Wess和Zumino （CCWZ）引入的非线性表示。这些模型基于SU(5)l × Hr/SO(5)的对称破断模式，其中Hr可以是SO(5)或其他更大的对称群。SU(5) 1扇区模型的结构与基于SU(5)/SO(5)的最小希格斯模型相同。由于全对称群是线性实现的，这些模型可以被认为是t不变模型的可能UV扩展，通过CCWZ使用非线性表示，它们与CCWZ具有相似的低能现象学。我们还讨论了如何在有或没有CCWZ构造的t不变模型上避免来自四费米子算子的约束。因此，电弱数据在对称破缺尺度f≥450 GeV上放置了一个非常弱的边界。
We construct T-parity invariant extensions of the littlest Higgs model, in which only linear representations of the full symmetry group are employed, without recourse to the non-linear representations introduced by Coleman, Callan, Wess, and Zumino (CCWZ). These models are based on the symmetry breaking pattern SU(5)l × Hr/SO(5), where Hr can be SO(5) or other larger symmetry groups. The structure of the models in the SU(5)l sector is identical to the littlest Higgs model based on SU(5)/SO(5). Since the full symmetry group is realized linearly, these models can be thought of as possible UV extensions of the T-invariant model using non-linear representations via CCWZ, with whom they share similar low energy phenomenology. We also comment on how to avoid constraints from four-fermion operators on T-invariant models with or without CCWZ construction. The electroweak data therefore place a very weak bound on the symmetry breaking scale, f ≥ 450 GeV.