Re(ϵK K) and K→ πνν¯ in a two-Higgs doublet model

Chuan Hung Chen, Takaaki Nomura

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19 Citations (Scopus)


The Kaon direct CP violation Re(ϵK K) 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 K), 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 K)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.

Original languageEnglish
Article number145
JournalJournal of High Energy Physics
Issue number8
Publication statusPublished - 2018 Aug 1

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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