The hMSSM approach for Higgs self-couplings revisited
The hMSSM approach for Higgs self-couplings revisited
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DOI：
10.1140/epjc/s10052-019-6594-x
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发表时间：
2018-10
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影响因子：
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通讯作者：
S. Liebler;M. Mühlleitner;M. Spira;M. Stadelmaier
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作者：
S. Liebler;M. Mühlleitner;M. Spira;M. Stadelmaier
我们将重希格斯玻色子的衰变与双希格斯玻色子的衰变进行比较，在单环水平上以费曼图解法计算，一方面基于最小超对称标准模型（MSSM）中涉及顶夸克和停止的全部有效势，并伴随匹配的双希格斯双峰模型（2HDM）作为其低能极限，另一方面基于 hMSSM 近似。我们确定了由于 hMSSM 希格斯自耦合中顶夸克的缺失贡献，当考虑到这一点时，hMSSM 和完整 MSSM 计算之间具有良好的一致性，至少在 Higgsino 质量参数与截止谱相比较小的限制下。我们还分别针对我们在 MSSM 和 hMSSM 中的计算彻底分析了费曼图解方法固有的动量相关和动力学校正以及与有效拉格朗日的匹配，并且对于后者建议包括来自顶夸克的附加校正，这些校正与未知的超对称谱无关。
We compare the decay of the heavy Higgs boson into twoSM-like Higgs bosons,, calculated in a Feynman-diagrammatic approach at the one-loop level based on the one hand on the full effective potential involving the top quark and stops in the Minimal Supersymmetric Standard Model (MSSM) accompanied by the matched Two-Higgs-Doublet Model (2HDM) as its low-energy limit and on the other hand on the hMSSM approximation. We identify missing contributions due to the top quark in the Higgs self-couplings of the hMSSM, that – when taken into account – lead to a good agreement between the hMSSM and a fullMSSMcalculation, at least in the limit of the Higgsino mass parameterbeing small compared to the stop spectrum. We also thoroughly analyze momentum-dependent and kinetic corrections intrinsic to the Feynman-diagrammatic approach and the matching to the effective Lagrangian, respectively, for both our calculation in theMSSMand the hMSSM and for the latter suggest to include additional corrections from the top quark, which are independent of the unknown supersymmetric spectrum.