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arXiv 1302.6505hep-ph
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LHC之后的三重态希格斯玻色子对撞机现象学

Triplet Higgs boson collider phenomenology after the LHC

Christoph Englert, Emanuele Re, Michael Spannowsky

摘要:

ATLAS和CMS发现了一种标准模型类希格斯粒子。主要的发现渠道之一是希格斯衰变为两个光子,目前,这似乎大大增强了标准模型的预期。在模型中加入额外的荷电物质耦合到希格斯扇区,可以提高或降低希格斯到两个光子的分支比。我们以此为动机,用最近在大型强子对撞机上进行的SM希格斯玻色子的搜索结果来对抗所谓的希格斯三胞胎的乔治-马查切克模型。我们还调查了模型的区域允许的参数空间相关的SM-样现象。Georgi-Machacek模型避免了T参数的树级问题,同时与标准模型相比,提供了一个大大修改的希格斯现象学。这是以引入另一个与电弱精密测量相关的微调问题为代价的。我们调查的碰撞机现象的Georgi-Machacek模型在现有的碰撞机的限制超出任何有效场论近似和上下文我们的研究结果与电弱精度的限制。

英文摘要:

ATLAS and CMS have discovered a Standard Model Higgs-like particle. One of the main discovery channels is the Higgs decay to two photons, which, at the moment, seems to be considerably enhanced over the Standard Model expectation. Models with additional charged matter coupling to the Higgs sector can enhance or decrease the Higgs to two photons branching ratio. We take this as motivation to confront the so-called Georgi-Machacek model of Higgs triplets with the results of recent searches for a SM Higgs boson performed at the LHC. We also investigate the model in regions of the allowed parameter space relevant for a SM-like phenomenology. The Georgi-Machacek model avoids tree-level issues of the T parameter, while offering a vastly modified Higgs phenomenology compared to the Standard Model. This comes at the price of introducing another fine-tuning problem related to electroweak precision measurements. We investigate the collider phenomenology of the Georgi-Machacek model in the light of existing collider constraints beyond any effective field theory approximation and contextualize our findings with electroweak precision constraints.

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