Overview on Flavour Physics
he NA62 experiment at CERN collected a large sample of in-flight $K^+$ decays during Run 1 (2016–2018) and resumed data taking for Run 2 in 2021, with operations expected to continue through 2026. This talk will present the current status of several NA62 analyses - including precision tests of the CKM matrix based on a dedicated low-intensity data sample collected in 2024–2025 - and discuss...
The J-PARC KOTO experiment, which searches for the rare neutral kaon decay $K_L \to \pi^0 \nu \overline{\nu}$, is now in the stage of stable data accumulation. As for the 30GeV Main Ring accelerator, the beam power of the slow extraction reaches more than 90kW recently, which is close to an immediate goal intensity. On the experimental side, the detector and the DAQ system are well...
The Hadron Experimental Facility (HEF) at J-PARC utilizes a slowly extracted 30-GeV proton beam and provides a variety of secondary particle beams such as pions, kaons, and autiprotons for particle and nuclear physics experiments. The KL beam line serves a neutral kaon beam for a kaon rare decay experiment, KOTO. The K1.8 and K1.8BR beam lines provide charged secondary beams with the momentum...
We proposed the KOTO II experiment at J-PARC to measure the branching ratio of the rare decay $K_L\to\pi^0\nu\bar{\nu}$ with 82 members from 11 countries. KOTO II is a next-generation experiment aiming at the operation in the 2030s. A new beamline with a 5-degree extraction angle and a new detector with a 12-meter-long signal decay region and a 3-meter diameter calorimeter were designed. A...
X-ray Free-Electron Laser (XFEL) facilities are state-of-the-art instruments that produce extremely intense, coherent, and ultrafast X-ray pulses. By combining principles of accelerator and laser physics, they offer unprecedented spatial and temporal resolution, enabling breakthroughs in areas such as protein structure determination, atomic-scale imaging, high-energy density physics, and...
Round Table Discussion on Future of Kaon Physics
