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Revisiting Kaon Physics in General $Z$ Scenario
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abstract
New physics contributions to the $Z$ penguin are revisited in the light of the recently-reported discrepancy of the direct CP violation in $K\to\pi\pi$. Interference effects between the standard model and new physics contributions to $\Delta S = 2$ observables are taken into account. Although the effects are overlooked in the literature, they make experimental bounds significantly severer. It is shown that the new physics contributions must be tuned to enhance $\mathcal{B}(K_L \to \pi^{0} \nu \bar{\nu})$, if the discrepancy of the direct CP violation is explained with satisfying the experimental constraints. The branching ratio can be as large as $6 \times 10^{-10}$ when the contributions are tuned at the 10 % level.
Forward citations
Cited by 2 Pith papers
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Observation of the $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay and measurement of its branching ratio
NA62 observes K+ -> pi+ nu nu-bar with 5 sigma significance and measures B = (13.0+3.3-3.0) x 10^-11, the smallest branching ratio measured above 5 sigma.
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Correlating $\epsilon^\prime/\epsilon$ to hadronic $B$ decays via $U(2)^3$ flavour symmetry
A U(2)^3 flavour-symmetric effective field theory can consistently explain the epsilon'/epsilon anomaly and hadronic B decay CP asymmetries, with a global fit about 3 sigma better than the Standard Model.
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