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• W3101655213 abstract "We show that the Grossman-Nir (GN) bound, $text{Br}(K_Lto pi^0nu barnu)leq 4.3 , text{Br}(K^+to pi^+nu barnu)$, can be violated in the presence of light new physics with flavor violating couplings. We construct three sample models in which the GN bound can be violated by orders of magnitude, while satisfying all other experimental bounds. In the three models the enhanced branching ratio $text{Br}(K_Lto pi^0+{rm inv})$ is due to $K_Lto pi^0phi_1$, $K_Lto pi^0phi_1phi_1$, $K_Lto pi^0psi_1bar psi_1$ transitions, respectively, where $phi_1 (psi_1)$ is a light scalar (fermion) that escapes the detector. In the three models $text{Br}(K^+to pi^++{rm inv})$ remains very close to the SM value, while $text{Br}(K_Lto pi^0+{rm inv})$ can saturate the present KOTO bound. Besides invisible particles in the final state (which may account for dark matter) the models require additional light mediators around the GeV-scale." @default.
• W3101655213 created "2020-11-23" @default.
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• W3101655213 date "2020-07-01" @default.
• W3101655213 modified "2023-10-14" @default.
• W3101655213 title "Three exceptions to the Grossman-Nir bound" @default.
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• W3101655213 doi "https://doi.org/10.1007/jhep07(2020)229" @default.
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