Volume 476 - 42nd International Conference on High Energy Physics (ICHEP2024) - Quark and Lepton Flavour Physics
KOTO II at J-PARC to measure the branching ratio of $K_L\to \pi^0\nu\overline{\nu}$
H. Nanjo*  on behalf of the KOTO Collaboration
*: corresponding author
Full text: pdf
Pre-published on: January 03, 2025
Published on: April 29, 2025
Abstract
The KOTO II is a next-generation experiment to measure the branching ratio of $K_L\to \pi^0\nu\bar{\nu}$ with 30-GeV proton beam at J-PARC. The KOTO II is a successor of the currently running KOTO experiment. We plan to expand the hadron experimental facility at J-PARC, and construct a new beamline of KOTO II there. The extraction angle of the $K_L$ is 5 degrees, smaller than that in KOTO to have more $K_L$ with a harder momentum spectrum.
The KOTO II detector is being designed with a 12-m signal decay region
and a 3-m diameter calorimeter to have more signal acceptance. The expected numbers of signal and background events are 35 and 40, respectively. Here, the Standard Model value of the branching ratio and $3\times 10^7$-s running time are assumed. The signal can be observed with $5\sigma$ significance. The design, current developments, and the expected sensitivity of KOTO II will be reported.
DOI: https://doi.org/10.22323/1.476.0464
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.