PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Parallel: Quark and Lepton Flavor Physics
Search for the rare decay of $K^{0}_L\rightarrow\pi^{0}\nu\bar{\nu}$ at J-PARC
K. Shiomi* on behalf of the KOTO collaboration
*corresponding author
Full text: pdf
Published on: August 02, 2019
Abstract
The KOTO experiment is dedicated to study the rare decay $K^0 _L\rightarrow \pi^0 \nu \bar\nu$ at the J-PARC 30 GeV Main Ring.
The $K^0 _L\rightarrow \pi^0 \nu \bar\nu$ decay breaks the CP symmetry directly and is highly
suppressed in the Standard Model (SM). Thus, this decay is sensitive to new physics
beyond the SM, in particular new sources of CP violation.
After the first physics run in 2013, the KOTO collaboration improved the detector
in order to suppress the backgrounds newly found in the analysis.
We resumed physics run in 2015 and collected about 20 times larger amount of data in the year.
From the 2015 data analysis, no events were observed with the expected background
of $0.4\pm0.18$. We set an upper limit of $3.0\times10^{-9}$ at the 90%
confidence level on the branching ratio. The result improves the previous limit by an order of magnitude.
DOI: https://doi.org/10.22323/1.340.0528
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