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arXiv 1402.2987hep-ph
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LHC的最小复合希格斯模型

Minimal Composite Higgs Models at the LHC

Marcela Carena, Leandro Da Rold, Eduardo Ponton

摘要:

我们考虑复合希格斯模型中的希格斯粒子是一个伪南武戈德斯通玻色子所产生的自发破缺的近似全球对称性的一些基本的强动力学。在部分复合范式下,我们研究SO(5)-> SO(4)对称性破缺模式.我们研究了由强动力学产生的费米子表象与标准模型(SM)自由度混合对希格斯物理学的影响。我们考虑基于SO(5)的最低维表示的模型,该模型允许Z -> b b耦合的监护保护,即5,10和14。我们发现一个通用的抑制胶子融合过程,而希格斯分支分数可以增强或抑制相比,SM。有趣的是,对希格斯玻色子玻色子耦合的精确测量可以区分费米子扇区中的不同实现,从而提供关于紫外动力学性质的关键信息。

英文摘要:

We consider composite Higgs models where the Higgs is a pseudo-Nambu Goldstone boson arising from the spontaneous breaking of an approximate global symmetry by some underlying strong dynamics. We focus on the SO(5) -> SO(4) symmetry breaking pattern, assuming the partial compositeness paradigm. We study the consequences on Higgs physics of the fermionic representations produced by the strong dynamics, that mix with the Standard Model (SM) degrees of freedom. We consider models based on the lowest-dimensional representations of SO(5) that allow for the custodial protection of the Z -> b b coupling, i.e. the 5, 10 and 14. We find a generic suppression of the gluon fusion process, while the Higgs branching fractions can be enhanced or suppressed compared to the SM. Interestingly, a precise measurement of the Higgs boson couplings can distinguish between different realizations in the fermionic sector, thus providing crucial information about the nature of the UV dynamics.

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