Di-Higgs boson peaks and top valleys: Interference effects in Higgs sector extensions
Di-Higgs boson peaks and top valleys: Interference effects in Higgs sector extensions
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DOI：
10.1103/physrevd.101.015019
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发表时间：
2019-09
影响因子：
5
通讯作者：
P. Basler;S. Dawson;C. Englert;M. Muhlleitner
中科院分区：
文献类型：
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作者：
P. Basler;S. Dawson;C. Englert;M. Muhlleitner
在具有扩展标量和CP破坏的模型中，双Higgs终态的共振搜索与顶夸克终态的相关搜索是发现超越标准模型(BSM)物理的最佳通道。这种互补性对于旨在强调多希格斯产生作为研究BSM现象的标准蜡烛的基准情景特别相关。在本文中，我们比较了复单重态和复双希格斯双态模型中t‘t末态的干涉效应和双希格斯产生的关联现象。我们的结果表明，与t‘t共振搜索相比，在di-Higgs搜索中发现BSM的潜力可能被低估。顶部对最终状态通常由于破坏性信号-背景干扰而被抑制，而HH最终状态可能由于信号-信号干扰而被增强。对于两个重希格斯共振在质量上完全分开的参数选择，相对于天真的信号期望，顶端终态被抑制，而对于双希格斯终态，产生截面乘以分支比的估计保持在O(10%)水平。
In models with extended scalars and CP violation, resonance searches in double Higgs final states stand in competition with related searches in top quark final states as optimal channels for the discovery of beyond the Standard Model (BSM) physics. This complementarity is particularly relevant for benchmark scenarios that aim to highlight multi-Higgs production as a standard candle for the study of BSM phenomena. In this paper, we compare interference effects in t¯t final states with correlated phenomena in double Higgs production in the complex singlet and the complex two-Higgs-doublet models. Our results indicate that the BSM discovery potential in di-Higgs searches can be underestimated in comparison to t¯t resonance searches. Top pair final states are typically suppressed due to destructive signal-background interference, while hh final states can be enhanced due to signal-signal interference. For parameter choices where the two heavy Higgs resonances are well separated in mass, top final states are suppressed relative to the naive signal expectation, while estimates of the production cross section times branching ratio remain accurate at the O(10%) level for double Higgs final states.