Leading two-loop corrections to the Higgs boson self-couplings in models with extended scalar sectors

Leading two-loop corrections to the Higgs boson self-couplings in models with extended scalar sectors
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在具有扩展标量扇区的模型中对希格斯玻色子自耦合进行领先的双环修正

DOI:
10.1140/epjc/s10052-020-7723-2
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发表时间:
2019
影响因子:
4.4
通讯作者:
Shinya Kanemura
Shinya Kanemura
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Johannes Braathen;Shinya Kanemura

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本文用有效势近似计算了扩展Higgs扇区模型中Higgs三线性耦合和Higgs四次耦合的主要双圈修正。在本文中,我们提供了所有必要的细节,我们的计算,并presentalexpressions出现在两个循环的有效势的积分导数。我们还考虑了三个特定的超越标准模型(BSM)的情况下,即一个典型的情况下,惰性的双重模型(IDM),和场景的两个希格斯双重模型(2 HDM)和希格斯单重模型(HSM)没有标量混合-我们包括所有必要的有限的计数项,以获得(除了tofresults)的壳方案表达式的修正希格斯自耦合。有了这些分析结果,我们调查的可能幅度的两个循环BSM贡献的希格斯自耦合和命运的非去耦效应,已知出现在一个循环。我们发现,至少只要微扰么正性条件得到满足,两个循环的校正的大小仍然远低于一个循环的校正。通常情况下,两个回路的贡献约为一个回路的20%,这意味着在一个回路观察到的非去耦效应没有显着修改,但也意味着高阶校正需要考虑到未来的精确测量希格斯三线性耦合的前景。
We compute the dominant two-loop corrections to the Higgs trilinear couplingand to the Higgs quartic couplingin models with extended Higgs sectors, using the effective-potential approximation. We provide in this paper all necessary details about our calculations, and present generalexpressions for derivatives of the integrals appearing in the effective potential at two loops. We also consider three particular Beyond-the-Standard-Model (BSM) scenarios – namely a typical scenario of an Inert Doublet Model (IDM), and scenarios of a Two-Higgs-Doublet Model (2HDM) and of a Higgs Singlet Model (HSM) without scalar mixing – and we include all the necessary finite counterterms to obtain (in addition toresults) on-shell scheme expressions for the corrections to the Higgs self-couplings. With these analytic results, we investigate the possible magnitude of two-loop BSM contributions to the Higgs self-couplings and the fate of the non-decoupling effects that are known to appear at one loop. We find that, at least as long as pertubative unitarity conditions are fulfilled, the size of two-loop corrections remains well below that of one-loop corrections. Typically, two-loop contributions toamount to approximately 20% of those at one loop, implying that the non-decoupling effects observed at one loop are not significantly modified, but also meaning that higher-order corrections need to be taken into account for the future perspective of precise measurements of the Higgs trilinear coupling.
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