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arXiv 1805.08005hep-ph
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重中微子对GUT标度超对称双Higgs模型真空稳定性的影响

Effects of heavy neutrinos on vacuum stability in two-Higgs-doublet model with GUT scale supersymmetry

V Suryanarayana Mummidi, Vishnu P. K., Ketan M. Patel

摘要:

本文分析了右手中微子对高尺度超对称双Higgs偶线模型中电弱真空稳定性的影响。假设超对称性在$M_S = 2 \times 10^{16}$ GeV尺度下破缺,低于$M_S$的有效理论是具有三代单重态中微子的II型双Higgs模型,通过I型跷跷板机制诱导出小质量的标准模型中微子。我们研究了高低比例版本的跷跷板机制。在这两种情况下,我们表明,右手中微子的存在显着提高电弱真空的稳定性,如果他们的汤川耦合的SM轻子是${\cal O}(1)$或更大。然而,这种可能性受到希格斯玻色子的测量质量和耦合以及来自味道物理数据的带电希格斯玻色子质量的限制的严重限制。结果表明,稳定或亚稳定的电弱真空和实验上可行的低能标量谱需要$\tanβ\lsim 2.5$,并且中微子汤川耦合的量级小于${\cal O}(1)$。在这种情况下得到的结果是定性相似的那些没有右手中微子。

英文摘要:

We analyse the implications of right-handed neutrinos on the stability of the electroweak vacuum in two-Higgs-doublet models with supersymmetry at high scale. It is assumed that supersymmetry is broken at scale $M_S = 2 \times 10^{16}$ GeV and effective theory below $M_S$ is two-Higgs-doublet model of type II with three generations of singlet neutrinos which induce small masses for the standard model neutrinos through type I seesaw mechanism. We study the high and low scale versions of seesaw mechanism. In both these cases, we show that the presence of right-handed neutrinos significantly improves the stability of electroweak vacuum if their Yukawa couplings with the SM leptons are of ${\cal O}(1)$ or greater. However, this possibility is severely constrained by the measured mass and couplings of Higgs and limits on the mass of the charged Higgs from the flavour physics data. It is shown that the stable or metastable electroweak vacuum and experimentally viable low energy scalar spectrum require $\tanβ\lsim 2.5$ and the magnitude of neutrino Yukawa couplings smaller than ${\cal O}(1)$. The results obtained in this case are qualitatively similar to those without right-handed neutrinos.

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