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arXiv 1804.06017hep-phhep-ex
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双Higgs模型中的$ε'_K/ε_K$和$K \to πν\barν$

$ε'_K/ε_K$ and $K \to πν\barν$ in a two-Higgs doublet model

Chuan-Hung Chen, Takaaki Nomura

备注：
33 pages, 10 figures, version accepted for publication in JHEP
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摘要：

用RBC-UKQCD格点和大的$N_c$对偶QCD计算的标准模型中的$2σ$的实验数据之下的K介子直接CP破坏$Re(ε'_K/ε_K)$表明了新物理效应的必要性。为了解决$Re(ε'_K/ε_K)$的不足，我们研究了一般的双Higgs模型中的荷电Higgs贡献。如果我们假设CP破坏相的起源是唯一的Kobayashi-Maskawa（KM）相，当同时考虑$B$ -和$K$ -介子混合、$B\to X_s γ$和Kaon间接CP破坏参数$ε_K$的约束时，我们发现通过带电Higgs效应的Kaon直接CP破坏可以达到$Re(ε'_K/ε_K)_{H^\pm}\sim 8 \times 10^{-4}$ .此外，在参数的约束下，稀有$K\to πν\barν$衰变的分支比可以是$BR(K^+\to π^+ ν\barν)\sim 14 \times 10^{-11}$和$BR(K_L\to π^0 ν\barν)\sim 3.6 \times 10^{-11}$，其结果可以分别通过CERN的NA 62实验和J-PARC的KOTO实验进行检验.

英文摘要：

The Kaon direct CP violation $Re(ε'_K/ε_K)$ below the experimental data of a $2σ$ in the standard model, which is calculated using the RBC-UKQCD lattice and a large $N_c$ dual QCD, indicates the necessity of a new physics effect. In order to resolve the insufficient $Re(ε'_K/ε_K)$, 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, $B\to X_s γ$, and Kaon indirect CP violating parameter $ε_K$ are simultaneously taken into account, it is found that the Kaon direct CP violation through the charged-Higgs effects can reach $Re(ε'_K/ε_K)_{H^\pm}\sim 8 \times 10^{-4}$. Moreover, with the constrained values of the parameters, the branching ratios of the rare $K\to πν\barν$ decays can be $BR(K^+\to π^+ ν\barν)\sim 14 \times 10^{-11}$ and $BR(K_L\to π^0 ν\barν)\sim 3.6 \times 10^{-11}$, where the results can be tested through the NA62 experiment at CERN and the KOTO experiment at J-PARC, respectively.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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