Two-loop corrections to the Higgs trilinear coupling in models with extended scalar sectors
Two-loop corrections to the Higgs trilinear coupling in models with extended scalar sectors
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DOI：
10.22323/1.390.0051
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发表时间：
2020-02
期刊：
影响因子：
--
通讯作者：
Johannes Braathen;S. Kanemura
中科院分区：
文献类型：
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作者：
Johannes Braathen;S. Kanemura
希格斯三线性耦合提供了一个独特的机会来研究希格斯扇区的结构并探索 BSM 物理的间接迹象 - 即使新状态以某种方式隐藏。在具有扩展希格斯扇区的模型中，由于涉及附加标量态的辐射校正中的非解耦效应，希格斯三线性耦合中的大偏差可能出现在一个环路中。那么很自然地就会问，二环修正如何修改这个结果，以及是否会再次出现新的大修正。我们提出了几个具有扩展标量扇区的模型中对希格斯三线性耦合的主要二环修正的新结果。我们用数值示例说明了解析表达式，并表明，虽然它们仍然小于单环对应物，并且不会显着改变在一个环中观察到的非解耦效应，但两环校正并非完全可以忽略不计——典型大小为单环校正的 10-20%。
The Higgs trilinear coupling provides a unique opportunity to study the structure of the Higgs sector and probe indirect signs of BSM Physics -- even if new states are somehow hidden. In models with extended Higgs sectors, large deviations in the Higgs trilinear coupling can appear at one loop because of non-decoupling effects in the radiative corrections involving the additional scalar states. It is then natural to ask how two-loop corrections modify this result, and whether new large corrections can appear again. We present new results on the dominant two-loop corrections to the Higgs trilinear coupling in several models with extended scalar sectors. We illustrate the analytical expressions with numerical examples and show that, while they remain smaller than their one-loop counterparts and do not modify significantly the non-decoupling effects observed at one loop, the two-loop corrections are not entirely negligible -- a typical size being 10-20% of the one-loop corrections.