Semi-aligned two Higgs doublet model

Abstract

In the left-right symmetric model based on $SU(2{)}_L\times SU(2{)}_R\times U(1{)}_{B-L}$ gauge symmetry, there appear heavy neutral scalar particles mediating quark flavor changing neutral currents (FCNCs) at tree level. We consider a situation where such FCNCs give the only sign of the left-right model while $W_R$ gauge boson is decoupled, and name it "semi-aligned two Higgs doublet model" because the model resembles a two Higgs doublet model with mildly-aligned Yukawa couplings to quarks. We predict a correlation among processes induced by quark FCNCs in the model, and argue that future precise calculation of meson-antimeson mixings and CP violation therein may hint at the semi-aligned two Higgs doublet model and the left-right model behind it.

30 pages, 6 figures and 3 tables

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• Status of the semileptonic $B$ decays and muon g-2 in general 2HDMs with right-handed neutrinos
• Kaon CP violation and neutron EDM in the minimal left-right symmetric model
• Flavor physics in the multi-Higgs doublet models induced by the left-right symmetry