The Kaon direct CP violation Re(ϵK ′/ϵK) below the experimental data of a 2σ in the standard model, which is calculated using the RBC-UKQCD lattice and a large Nc dual QCD, indicates the necessity of a new physics effect. In order to resolve the insufficient Re(ϵK ′/ϵK), we study the charged-Higgs contributions in a generic two-Higgs-doublet model. If we assume that the origin of the CP-violation phase is uniquely from the Kobayashi-Maskawa (KM) phase when the constraints from the B- and K-meson mixings, B → Xsγ, and Kaon indirect CP violating parameter ϵK are simultaneously taken into account, it is found that the Kaon direct CP violation through the charged-Higgs effects can reach Re(ϵK ′/ϵK)H ± ∼ 8 × 10− 4. Moreover, with the constrained values of the parameters, the branching ratios of the rare K→ πνν¯ decays can be BR(K+→π+νν¯)∼13×10−11 and BR(KL→ π0νν¯ ) ∼ 3.6 × 1 0 − 11, where the results can be tested through the NA62 experiment at CERN and the KOTO experiment at J-PARC, respectively.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics