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arXiv 1711.04097hep-ph
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强一级电弱相变中的CP破坏2 HDM及其对Higgs对产生的意义

The CP-Violating 2HDM in Light of a Strong First Order Electroweak Phase Transition and Implications for Higgs Pair Production

Philipp Basler, Margarete Mühlleitner, Jonas Wittbrodt

摘要:

研究了CP破坏的2-Higgs-Doublet模型(C2 HDM)中的电弱相变(EWPT)强度.通过应用重正化方案,使有效的扫描的C2 HDM参数空间,我们分析了一个强大的一阶EWPT所需的重子生成的可能性,并研究其现象学的LHC的影响。与CP守恒的(实)2 HDM(R2 HDM)一样,我们发现强EWPT有利于非SM类希格斯玻色子玻色子之间的质量隙。这些导致了由规范+希格斯玻色子玻色子或成对的希格斯玻色子玻色子组成的显著的末态。与R2 HDM相反,C2 HDM的CP混合也有利于近似质量简并光谱,主要衰变为SM粒子。强EWPT的要求进一步允许我们使用类SM希格斯玻色子的信号强度来区分C2 HDM和R2 HDM。我们还发现,一个强大的EWPT需要一个增强的SM-样三线希格斯耦合在下一个领先的顺序(NLO)由高达2.4倍的NLO SM耦合相比,建立另一个宇宙学和对撞机现象之间的联系。我们提供了几个C2 HDM基准测试方案兼容一个强大的EWPT和所有的实验和理论约束。我们包括非SM类希格斯玻色子的主导分支比以及SM类希格斯玻色子玻色子截面的每个基准点的希格斯对生产。与SM相比,对产生的截面可以大大增强,并且可以在高光度LHC上观察到,从而可以获得三线性希格斯耦合。

英文摘要:

We investigate the strength of the electroweak phase transition (EWPT) within the CP-violating 2-Higgs-Doublet Model (C2HDM). By applying a renormalisation scheme which allows efficient scans of the C2HDM parameter space, we analyse the possibility of a strong first order EWPT required for baryogenesis and study its phenomenological implications for the LHC. Like in the CP-conserving (real) 2HDM (R2HDM) we find that a strong EWPT favours mass gaps between the non-SM-like Higgs bosons. These lead to prominent final states comprised of gauge+Higgs bosons or pairs of Higgs bosons. In contrast to the R2HDM, the CP-mixing of the C2HDM also favours approximately mass degenerate spectra with dominant decays into SM particles. The requirement of a strong EWPT further allows us to distinguish the C2HDM from the R2HDM using the signal strengths of the SM-like Higgs boson. We additionally find that a strong EWPT requires an enhancement of the SM-like trilinear Higgs coupling at next-to-leading order (NLO) by up to a factor of 2.4 compared to the NLO SM coupling, establishing another link between cosmology and collider phenomenology. We provide several C2HDM benchmark scenarios compatible with a strong EWPT and all experimental and theoretical constraints. We include the dominant branching ratios of the non-SM-like Higgs bosons as well as the Higgs pair production cross section of the SM-like Higgs boson for every benchmark point. The pair production cross sections can be substantially enhanced compared to the SM and could be observable at the high-luminosity LHC, allowing access to the trilinear Higgs couplings.

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