Search for the Decay K_L → π^0\nu\bar{\nu} at the J-PARC KOTO Experiment

This book reports on a new result from the KL?p0?? search at the J-PARC KOTO experiment, which sets an upper limit of 3×10-9 for the branching fraction of the decay at the 90% confidence level, improving the previous best limit by an order of magnitude.