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
Full text: pdf
Published on: August 02, 2019
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
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.