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arXiv 1111.3369hep-ph
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全辐射电弱对称破缺对小Higgs粒子的约束

Constraints on Little Higgs with Fully-Radiative Electroweak Symmetry Breaking

Roshan Foadi, Carl R. Schmidt, Jiang-Hao Yu

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28 pages, 16 figures, RevTeX format
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摘要：

在最近的一篇论文中，我们介绍了一个新的小希格斯模型，它包含规范结构$SU(2)^3\times U(1)$，嵌入在一个近似的全球$SO(5)\times SO(5)$对称性。在打破标准模型$SU(2)_L \times U(1)_Y$后，这产生了两个重$Z^\prime$玻色子和两个重$W^{\prime\pm}$玻色子，以及一个类似标准模型的希格斯标量。该模型的独特之处在于，完全可以从微扰环对希格斯有效势的贡献中获得电弱对称性破缺和轻希格斯质量。在本文中，我们考虑这个模型上的电弱约束，包括树和循环的贡献的通用斜和非斜参数，树级校正$ZWW$顶点，树和循环级校正$Zb\bar{b}$。最重要的修正是对$\hat{S}$的正的树级修正和对$\hat{T}$的负的费米子环修正，它们要求整体对称性破缺的尺度为$\gtrsim2$ TeV，这取决于顶夸克混合参数和额外的规范耦合。此外，对$Zb\bar{b}$的回路修正包含一个发散，该发散必须被吸收到理论中的一个新算子的系数中。然而，该$Zb\bar{b}$校正的有限部分是可忽略的。

英文摘要：

In a recent paper, we introduced a new Little Higgs model, which contains the gauge structure $SU(2)^3\times U(1)$, embedded in an approximate global $SO(5)\times SO(5)$ symmetry. After breaking to the standard model, $SU(2)_L \times U(1)_Y$, this produces two heavy $Z^\prime$ bosons and two heavy $W^{\prime\pm}$ bosons, along with a single Standard Model-like Higgs scalar. The unique feature of the model was that it was possible to obtain electroweak symmetry breaking and a light Higgs mass entirely from perturbative loop contributions to the Higgs effective potential. In this paper we consider the electroweak constraints on this model, including tree and loop contributions to the universal oblique and non-oblique parameters, tree-level corrections to the $ZWW$ vertex, and tree and loop level corrections to $Zb\bar{b}$. The most significant corrections are positive tree-level corrections to $\hat{S}$ and negative fermion-loop corrections to $\hat{T}$, which require that the scale for the global symmetry breaking be $\gtrsim2$ TeV, depending on the top-quark mixing parameter and the extra gauge couplings. In addition, the loop corrections to $Zb\bar{b}$ contain a divergence that must be absorbed into the coefficient of a new operator in the theory. The finite part of this $Zb\bar{b}$ correction, however, is negligible.

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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