First Search for the $K_L\to {\pi }^0\gamma$ Decay

J. K. Ahn, B. Beckford, M. Campbell +59

We report the first search for the $K_L\to {\pi }^0\gamma$ decay, which is forbidden by Lorentz invariance, using the data from 2016 to 2018 at the J-PARC KOTO experiment. With a single ev…