Search for $K_L\to {\pi }^0\nu \overline{\nu }$ and $K_L\to {\pi }^0{X}^0$ Decays at the J-PARC KOTO Experiment

KOTO Collaboration, J. K. Ahn, B. Beckford +67

A search for the rare decay $K_L\to {\pi }^0\nu \overline{\nu }$ was performed. With the data collected in 2015, corresponding to $2.2\times 10^{19}$ protons on target, a single event se…