Abstract
The KOTO experiment searches for the rare decay at J-PARC. The largest background in the data collected in 2016-2018 was caused by decays of K ±. To detect K ±, we are developing an in-beam charged veto detector to be installed upstream of the KOTO detector. It uses a 0.2mm-thick thin plastic scintillator. The escaped light is reflected and collected by a 12-μm-thick aluminized mylar, and read out by an array of PMTs placed outside the beam. We newly developed PMT bases to be used for this detector. Based on an electron beam test, we expect the K ± background to be reduced by more than a factor 100. We plan to install this detector in the KOTO beam line, in December 2022.
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