Search for new physics through rare kaon decays at KOTO
Chieh Lin1*, Y.-C. Tung3, T. Wu2, Y. B. Hsiung2
1Department of physics, National Changhua University of Education, Changhua, Taiwan
2Department of physics, National Taiwan University, Taipei, Taiwan
3Department of physics, National Kaohsiung Normal University, Kaohsiung, Taiwan
* Presenter:Chieh Lin, email:clin@cc.ncue.edu.tw
Rare kaon decays are among the most sensitive probes to new physics scenarios. Of them, KL→π0νν, the CP-violating decay, is the most compelling channel to search for because the Standard Model predicts its branching ratio to be 3 × 10-11 with only 1% theoretical uncertainty. This mode is thus a physics playground for theorists. The KOTO experiment aims to search for this decay and has set the upper limit of 2 × 10-9 at the 90% confidence level using the data collected in 2021. This is the worldwide best limit to date. Meanwhile, KOTO is also ideal to search for the exotic light particles due to the hermeticity of the detector. The experimental efforts and the search status will be summarized in this talk.
Keywords: standard model, flavor physics, CP violation, exotic physics