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arXiv 1409.3579hep-ph
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具有标量三重态的类矢量夸克

Vector-like quarks with a scalar triplet

Estefania Coluccio Leskow, Travis Martin, Alejandro de la Puente

摘要:

我们研究了标准模型的一个最小扩展,其中包含一个额外的实标量三重态$Σ$和一个单一的矢量夸克$T$。这类模型自然地出现在最小希格斯模型的扩展中,它包含了暗物质,而不需要$T$ -宇称。我们假设三重态不会发展出真空期望值,并且所有将三重态耦合到标准模型场和矢量类夸克的五维算符都具有$Λ$尺度的特征,在这个尺度上,我们期望新的物理学出现。我们在新的标量扇区和费米子扇区之间引入了新的不可重整化的相互作用,使得标准模型第三代上型夸克和类矢量夸克之间的混合能够导致从顶夸克到希格斯玻色子质量的单圈修正的主要二次发散的取消。在这个框架内,新的衰变模式的矢量夸克的真正的标量三重态和SM粒子的出现,并带来了一个机会来探测这个模型与现有的和未来的LHC数据。我们对比直接对撞机搜索与低能量精度测量的约束,发现重矢量类顶夸克的质量低至$650$ GeV是一致的,与当前的实验约束模型中,新的物理出现在低于$2$ TeV的尺度。

英文摘要:

We study a minimal extension to the Standard Model with an additional real scalar triplet, $Σ$, and a single vector-like quark, $T$. This class of models appear naturally in extensions of the Littlest Higgs model that incorporate dark matter without the need of $T$-parity. We assume the limit that the triplet does not develop a vacuum expectation value and that all dimension five operators coupling the triplet to Standard Model fields and the vector-like quarks are characterized by the scale $Λ$ at which we expect new physics to arise. We introduce new non-renormalizable interactions between the new scalar sector and fermion sector that allow mixing between the Standard Model third generation up-type quark and the vector-like quark in a way that leads to the cancellation of the leading quadratic divergences to the one-loop corrections from the top quark to the mass of the Higgs boson. Within this framework, new decay modes of the vector-like quark to the real scalar triplet and SM particles arise and bring forth an opportunity to probe this model with existing and future LHC data. We contrast constraints from direct colliders searches with low energy precision measurements and find that heavy vector-like top quarks with a mass as low as $650$ GeV are consistent with current experimental constraints in models where new physics arises at scales below $2$ TeV.

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