1. IE browser is NOT supported anymore. Please use Chrome, Firefox or Edge instead.
2. If you are a new user, please register to get an IHEP SSO account through https://login.ihep.ac.cn/registlight.jsp Any questions, please email us at helpdesk@ihep.ac.cn or call 88236855.
3. If you need to create a conference in the "Conferences, Workshops and Events" zone, please email us at helpdesk@ihep.ac.cn.
4. The max file size allowed for upload is 100 Mb.
Jul 2 – 8, 2023
Sun Yat-sen University Zhuhai Campus
Asia/Shanghai timezone

Search for Rare Neutral Kaon Decays at JPARC KOTO Experiment

Jul 5, 2023, 4:10 PM
25m
A280 (Haiqin Building #6)

A280

Haiqin Building #6

Speaker

Prof. Yee Bob Hsiung (Department of Physics National Taiwan University)

Description

We present the status of JPARC KOTO experiment to search for very rare $K_L$ decays to $\pi^0 \nu \overline{\nu}$ - an FCNC and direct $CP$ violating decay mode. KOTO has collected $K_L$ data yearly with 30 GeV high intensity proton beam on target at JPARC since 2015 until now with increasing beam power over this period up to 64.5 kW. The results from 2016-18 data published in 2021 ($ BR < 4.9 \times 10^{-9}$) revealed three candidate events in the signal region with $1.22 \pm 0.26$ estimated background events, dominated by the contamination of upstream charged kaon decays which was verified in 2020 run after installing upstream charged beam veto. More data has been accumulated since then. The status of blind analysis and background reductions will be reviewed in this talk with future beam power projections at JPARC and KOTO-DAQ upgrades. Plans for KOTO-II upgrades beyond the Standard Model sensitivity ($3 \times 10^{-10}$) will also be presented.

Primary author

Prof. Yee Bob Hsiung (Department of Physics National Taiwan University)

Presentation materials