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arXiv 1510.03450hep-ph
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γγ和ZZ通道中重Higgs共振信号的干扰效应

Interference effect on heavy Higgs resonance signal in γγand ZZ channels

Sunghoon Jung, Jeonghyeon Song, Yeo Woong Yoon

备注：
22 pages, 10 figures; added discussion about real-part interference
发表信息：
Phys. Rev. D 93, 055035 (2016)
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摘要：

当共振宽度小于共振质量时，共振-连续谱干涉通常被忽略。我们重新检查这个标准，通过研究在高分辨率的衰变通道，$γγ$和$ZZ$，重希格斯玻色子$H^0$在近对齐的两个希格斯双重模型的干扰效应。对于$H^0$与次百分比的宽度质量比，我们发现，在参数空间中的LHC 14 TeV $ZZ$共振搜索可以是敏感的，干扰效应可以修改$ZZ$信号率由${\cal O}(10)\%$和排斥达到${\cal O}(10)$ GeV。在$ZZ$或$γγ$信号速率较小的其它参数空间中，LHC 14 TeV范围不存在，但是共振形状可以显著地改变得多。特别地，$γγ$信号速率可以改变${\cal O}(100)\%$。相关的参数空间，我们建议的变量，可以表征一般的共振形状。我们还说明了通过添加非标准衰变模式的重希格斯玻色子的干扰的宽度的相关性。

英文摘要：

The resonance-continuum interference is usually neglected when the width of a resonance is small compared to the resonance mass. We re-examine this standard by studying the interference effects in high-resolution decay channels, $γγ$ and $ZZ$, of the heavy Higgs boson $H^0$ in nearly aligned two-Higgs-doublet models. For the $H^0$ with a sub-percent width-to-mass ratio, we find that, in the parameter space where the LHC 14 TeV $ZZ$ resonance search can be sensitive, the interference effects can modify the $ZZ$ signal rate by ${\cal O}(10)\%$ and the exclusion reach by ${\cal O}(10)$ GeV. In other parameter space where the $ZZ$ or $γγ$ signal rate is smaller, the LHC 14 TeV reach is absent, but a resonance shape can be much more dramatically changed. In particular, the $γγ$ signal rate can change by ${\cal O}(100)\%$. Relevant to such parameter space, we suggest variables that can characterize a general resonance shape. We also illustrate the relevance of the width on the interference by adding non-standard decay modes of the heavy Higgs boson.

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