标题： Yukawa耦合在两个希格斯双重模型中的对齐 显示英文标题

标题： Alignment of Yukawa couplings in two Higgs doublet models

摘要： 我们研究了在一般双希格斯二重模型（2HDMs）框架下，Yukawa耦合的对齐情况，考虑了一个场景，其中最轻的中性希格斯玻色子完全是CP偶，而两个更重的中性希格斯玻色子在希格斯势中存在非平凡的CP破坏相位的情况下允许混合。 将最轻的中性希格斯玻色子识别为在大型强子对撞机（LHC）发现的125 GeV粒子，我们发现，在类型-I 2HDM中，无需解耦即可轻松实现Yukawa耦合的对齐，并且与当前LHC希格斯精确数据没有太多冲突。 否则，我们观察到，最轻希格斯玻色子的Yukawa耦合比希格斯与一对大质量矢量玻色子的耦合解耦得要慢得多，即使希格斯与矢量玻色子耦合的偏差低于百分之一水平，它们也会显著偏离相应的标准模型（SM）值。 另一方面，无论2HDM类型如何，也不管是否解耦，我们发现了一个错误符号的Yukawa耦合对齐极限，在该极限中，Yukawa耦合到下型夸克和/或带电轻子的强度与相应的SM值相同，但符号相反。 上型夸克Yukawa耦合的大小和符号与标准模型中的一致。 因此，在这种极限下，所有四种类型的2HDM都与LHC希格斯精确数据兼容。 显示英文摘要

摘要： We study the alignment of Yukawa couplings in the framework of general two Higgs doublet models (2HDMs) considering a scenario in which the lightest neutral Higgs boson is purely CP even while the two heavier neutral Higgs bosons are allowed to mix in the presence of nontrivial CP-violating phases in the Higgs potential. Identifying the lightest neutral Higgs boson as the 125 GeV one discovered at the LHC, we find that the alignment of Yukawa couplings without decoupling could be easily achieved in the type-I 2HDM with no much conflict with the current LHC Higgs precision data. Otherwise, we observe that the Yukawa couplings of the lightest Higgs boson could decouple much slowly compared to the Higgs coupling to a pair of massive vector bosons and they significantly deviate from the corresponding SM values even when the deviation of the Higgs to vector boson coupling is below the percent level. On the other hand, independently of 2HDM type and regardless of decoupling, we find a wrong-sign alignment limit of the Yukawa couplings in which the Yukawa couplings to the down-type quarks and/or those to the charged leptons are equal in strength but opposite in sign to the corresponding SM ones. The magnitude and sign of the up-type quark Yukawa couplings remain the same as in the SM. Accordingly, in this limit, all four types of 2HDMs are viable against the LHC Higgs precision data.