论文标题
两种Higgs Doublet模型中Yukawa耦合的对齐
Alignment of Yukawa couplings in two Higgs doublet models
论文作者
论文摘要
我们研究了Yukawa耦合在一般两个Higgs Doublet模型（2HDM）框架中的对齐，考虑到一种情况，即即使是两个重的中性希格斯玻色子，最浅的中性希格斯玻色子也纯粹是CP，即使允许在非散布CP-CP-CP-CP-CP-CP-CP-CP-CP阶段中混合使用。将最浅的中性希格斯玻色子识别为在LHC上发现的125 GEV，我们发现在I-I 2HDM中很容易实现Yukawa耦合的对齐，而与当前LHC HIGGS精确数据没有太多冲突，而没有太多冲突。否则，我们观察到，与Higgs耦合到一对巨大的矢量玻色子相比，最轻的希格斯玻色子的Yukawa耦合可能会缓慢地脱熟，并且即使在HIGGS偏离HIGGS到矢量boson耦合的偏差也偏离了相应的SM值。另一方面，与2HDM类型无关，无论是脱钩的，我们发现Yukawa耦合的错误签名对准极限，其中Yukawa耦合到下型夸克和/或所带电的lept子的耦合符号相等，但在相反的符号中相反。 Yukawa耦合的夸克Quark耦合的大小和迹象与SM相同。因此，在此限制下，所有四种类型的2HDM均与LHC Higgs精确数据可行。
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.
