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arXiv 1807.06322hep-ph
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在$\mathcal{CP}$ -违反NMSSM中中性希格斯玻色子衰变为PDKEEPAAA费米子和规范玻色子

Decays of the neutral Higgs bosons into SM fermions and gauge bosons in the $\mathcal{CP}$-violating NMSSM

Florian Domingo, Sven Heinemeyer, Sebastian Paßehr, Georg Weiglein

摘要:

次最小超对称标准模型(NMSSM)提供了一个丰富的框架,嵌入物理超越标准模型,以及一致的解释有关希格斯信号的结果在LHC检测。我们研究了中性希格斯粒子衰变为标准模型费米子和规范玻色子的过程。我们进行完整的单圈计算的衰变宽度,包括领先的高阶QCD校正。我们首先讨论我们的方法的技术方面,然后将我们的预测与现有的公共工具进行比较,进行数值分析并讨论剩余的理论不确定性。特别地,我们发现重希格斯玻色子玻色子到电弱规范玻色子的衰变宽度主要受辐射修正的影响,从而使得唯象分析中常用的树级近似失效.最后,我们专注于一个主要是单态的质量低于一个在$125\,$ GeV,一个场景,通常出现在NMSSM的唯象特性。事实上,在$100\,$ GeV附近或稍低的质量范围内,可能存在单重态主导态,这将具有有趣的现象学意义。这样的方案可以提供一个解释,在LEP在$e^+e^-\to Z(H\to b\bar{b})$搜索在$\sim 98\,$ GeV的$2.3σ$本地过剩和本地过剩的双光子搜索CMS最近报道在这个质量范围内,而在同一时间,它会减少“小层次”的问题。

英文摘要:

The Next-to-Minimal Supersymmetric Standard Model (NMSSM) offers a rich framework embedding physics beyond the Standard Model as well as consistent interpretations of the results about the Higgs signal detected at the LHC. We investigate the decays of neutral Higgs states into Standard Model (SM) fermions and gauge bosons. We perform full one-loop calculations of the decay widths and include leading higher-order QCD corrections. We first discuss the technical aspects of our approach, before confronting our predictions to those of existing public tools, performing a numerical analysis and discussing the remaining theoretical uncertainties. In particular, we find that the decay widths of doublet-dominated heavy Higgs bosons into electroweak gauge bosons are dominated by the radiative corrections, so that the tree-level approximations that are often employed in phenomenological analyses fail. Finally, we focus on the phenomenological properties of a mostly singlet-like state with a mass below the one at $125\,$GeV, a scenario that appears commonly within the NMSSM. In fact, the possible existence of a singlet-dominated state in the mass range around or just below $100\,$GeV would have interesting phenomenological implications. Such a scenario could provide an interpretation for both the $2.3σ$ local excess observed at LEP in the $e^+e^-\to Z(H\to b\bar{b})$ searches at $\sim 98\,$GeV and for the local excess in the diphoton searches recently reported by CMS in this mass range, while at the same time it would reduce the "Little Hierarchy" problem.

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