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A charged-particle veto detector was constructed to study the rare decay$K_{L} \rightarrow \pi^{0} \nu \bar{\nu}$ in the J-PARC K$^{\mathrm{O}}$TOexperiment. This detector consists of 3mm-thick plastic scintillator strips andwavelength shifting fibers coupled with MPPCs at the both ends, which makes itpossible to obtain large light output over the wide region. After theconstruction and installation to the K$^{\mathrm{O}}$TO experimental area, itsperformance was studied using charged particles from $K_{\mathrm{L}}$ decays.As a preliminary result, we found that the detector had the light yield largerthan 10p.e./100keV and the timing resolution better than 3ns for most regions,which satisfied the requirements to achieve the standard modelsensitivety($\sim10^{-11}$) for the $K_{L} \rightarrow \pi^{0} \nu \bar{\nu}$detection.

Charged-particle veto detector for the $K_L \to \pi^0 \nu \bar\nu$ study in the J-PARC K$^O$TO experiment