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Prospective studies on
K⁺→π⁺νν and K_L→π⁰νν rare kaon decays

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Reference

Prospective on rare Kaon decays : results and plots

Reference:

The plots and results in this web page are based on the theoretical and experimental framework summarised here:

The K⁺→π⁺νν and K_L→π⁰νν rare kaon decays

The SM predictions are based on the global fit from the EPS-HEP 2015 conference (Vienna, Austria).

Plots:

Predicted values of BR(K⁺→π⁺νν) in the Standard Model, using the global CKM fit. The measurement from the combined BNL-E747+E949 experiments is also overlaid.

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Predicted values of BR(K_L→π⁰νν) in the Standard Model, using the global CKM fit.

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Predicted values of BR(K⁺→π⁺νν) and BR(K_L→π⁰νν), in the Standard Model, using the global CKM fit.

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Constraint on the NNLO theoretical parameter P_c for the charm quark contribution to the K⁺→π⁺νν decay amplitude.

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Constraints in the (ρ̅, η̅) plane, using a prospective scenario for the NA62 and KOTO experiments. For NA62, a measurement of BR(K⁺→π⁺νν) with a 10% accuracy is assumed; for its corresponding constraint (light gray), the theoretical contribution to the uncertainty is indicated by the dashed region. For KOTO, a two-step prospective scenario is assumed : first, a 3σ evidence for the K_L→π⁰νν decay (Phase 1, lighter blue), followed by a later measurement of BR(K_L→π⁰νν) with 10% accuracy (Phase 2, darker blue). For the combined NA62+KOTO constraint, the theoretical contribution to the uncertainty is indicated with the dashed region.

α, β, γ convention	ϕ₁, ϕ₂, ϕ₃ convention
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