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Study of the $K_L \!\to\! \pi^0 \nu \overline{\nu}$ Decay at the J-PARC KOTO Experiment
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abstract
The rare decay $K_L \!\to\! \pi^0 \nu \overline{\nu}$ was studied with the dataset taken at the J-PARC KOTO experiment in 2016, 2017, and 2018. With a single event sensitivity of $( 7.20 \pm 0.05_{\rm stat} \pm 0.66_{\rm syst} ) \times 10^{-10}$, three candidate events were observed in the signal region. After unveiling them, contaminations from $K^{\pm}$ and scattered $K_L$ decays were studied, and the total number of background events was estimated to be $1.22 \pm 0.26$. We conclude that the number of observed events is statistically consistent with the background expectation. For this dataset, we set an upper limit of $4.9 \times 10^{-9}$ on the branching fraction of $K_L \!\to\! \pi^0 \nu \overline{\nu}$ at the 90% confidence level.
Forward citations
Cited by 2 Pith papers
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Proposal of the KOTO II experiment
KOTO II, a proposed next-generation J-PARC experiment, projects observing 35 Standard Model K_L to pi0 nu nu decays with 40 background events, a 5.6 sigma discovery potential.
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Constraints on Dark Photon and Dark $Z$ Model Parameters in the $B$ and $K$ Meson Decays
Only a fine-tuned dark Z model with cancelled electron couplings survives the combined constraints, but its muon g-2 contribution is orders of magnitude too large.
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