Speaker
Yi-Ting Su
(National Taiwan University)
Description
We report a study of the rare decay $K_L \to \pi^0 X$, $X \to e^+ e^−$ using KOTO Run92b data collected with a dedicated four-cluster trigger. We apply selection criteria to suppress dominant backgrounds such as $K_L \to \pi^0 \pi^+ \pi^-$, and $K_L \to e^+ e^− \gamma \gamma$, and evaluate the expected signal sensitivity. The analysis framework and background estimation strategies are presented, along with preliminary results and sensitivity projections for the rare decay search. This analysis can also search for the Standard Model rare decay $K_L \to \pi^0 e^+ e^−$, which is highly suppressed via flavor-changing neutral currents. Such studies can help the design of future KOTO II experiment.
Author
Yi-Ting Su
(National Taiwan University)