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The KOTO experiment at the J-PARC research facility in Tokai, Japan aims toobserve and measure the rare decay of the neutral kaon, $K_L^0 \rightarrow\pi^0 \nu \bar{\nu}$. This decay has a Standard Model (SM) predicted branchingratio (BR) of $(3.00 \pm 0.30) \times 10^{-11}$. While this decay is extremelyrare, it is one of the best decays in the quark sector to probe for new physicsbeyond the SM due to small theoretical uncertainties. The E391a experiment atKEK 12-GeV PS previously searched for $K_L^0 \rightarrow \pi^0 \nu \bar{\nu}$events and set a limit of BR($K_L^0 \rightarrow \pi^0 \nu \bar{\nu}$) $< 2.6\times 10^{-8}$ in 2010. In 2018, KOTO set a new experimental limit ofBR($K_L^0 \rightarrow \pi^0 \nu \bar{\nu}$) $< 3.0 \times 10^{-9}$ from datacollected in 2015, improving the best experimental upper limit by an order ofmagnitude. From 2016 to 2018, KOTO collected around 1.5 times more data than in2015, and the analysis of this dataset is underway. This report covers theprogress and current status of the 2016-2018 data analysis.

Status on the Search for $K_L^0 \rightarrow \pi^0 \nu \bar{\nu}$ with the KOTO Experiment