Di-Higgs production in SUSY models at the LHC
Di-Higgs production in SUSY models at the LHC
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DOI：
10.1140/epjp/s13360-020-00677-1
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
Peisi Huang;Yu Hang Ng
中科院分区：
文献类型：
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作者：
Peisi Huang;Yu Hang Ng
我们研究了在当前实验和理论约束所允许的参数空间中，在最小超对称标准模型和次最小超对称标准模型的背景下，通过胶子融合对di-Higgs产生的修正，这也与不久的将来的大型强子对撞机（LHC）实验有关。计算基于首阶费曼振幅的解析表达式（包括夸克和夸克环）。我们将di-Higgs产生截面分为共振、非共振和干涉部分，以便更好地理解在允许参数空间的不同区域中对di-Higgs产生率进行修改的机制。我们还研究了高亮度LHC（HL-LHC）在这些低能超对称模型中对di-Higgs产生的敏感性。此外，我们研究了双希格斯搜索和直接搜索BSM粒子和精确的希格斯耦合测量在HL-LHC之间的互补性。我们发现，通过共振产生，di-Higgs产生截面可以显著增强。在共振产生截面小的区域，由于希格斯耦合的修改，di-Higgs产生得到适度的增强。此外，双希格斯粒子的产生和单希格斯粒子的产生之间存在很强的相关性，并且在HL-LHC中双希格斯粒子的产生不如单希格斯粒子的产生敏感。
We study the modification to di-Higgs production via gluon fusion within the context of the minimal supersymmetric standard model and the next-to-minimal supersymmetric standard model in the parameter space allowed by current experimental and theoretical constraints, and also relevant to the Large Hadron Collider (LHC) experiments in the near future. The calculation is based on the analytical expression of the leading-order Feynman amplitudes (which includes both quark and squark loops). We separate the di-Higgs production cross section into resonant, non-resonant, and interference parts, in order to better understand the mechanisms that are responsible for the modification to di-Higgs production rate in different regions of the allowed parameter space. We also investigate the sensitivity of high-luminosity LHC (HL-LHC) to the di-Higgs production in these low-energy supersymmetry models. Furthermore, we examine the complementarity between di-Higgs searches and direct searches for BSM particles and precision Higgs couplings measurements at the HL-LHC. We found that the di-Higgs production cross section can be enhanced significantly through resonant production. In the region where the resonant production cross section is small, di-Higgs production receives a moderate enhancement due to the modifications in the Higgs couplings. In addition, there is a strong correlation between di-Higgs production and single Higgs production, and di-Higgs production is not as sensitive as single Higgs production at the HL-LHC.