Tag: Belle II Experiment

On February 20, 2024, the Belle II experiment resumed data acquisition for physics measurements. Belle II is a particle physics experiment designed to investigate the properties of particles, such as B mesons, produced by the SuperKEKB accelerator. This research aims to study new physical phenomena that are crucial for understanding the mechanisms behind the creation of the universe. Operations were suspended for about 18 months starting in the summer of 2022, and major improvements were made to both the accelerator …

Japan’s High Energy Accelerator Research Organization (KEK) has been steadily improving the performance of its flagship electron-positron collider, SuperKEKB, since it produced its first electron-positron collisions in April 2018.  At 20:34 on 15th June 2020, SuperKEKB achieved the world’s highest instantaneous luminosity for a colliding-beam accelerator, setting a record of 2.22×1034 cm-2 s-1. Previously, the KEKB collider, which was SuperKEKB’s predecessor and was operated by KEK from 1999 to 2010, had achieved the world’s highest luminosity, reaching 2.11×1034 cm-2 s-1. KEKB’s record …

  The Belle II experiment—an international collaboration of physicists searching for signs of undiscovered particles—has published the experiment’s first results in a paper selected as an Editors’ Suggestion in Physical Review Letters. The results offer physicists new clues in their hunt for dark matter, a substance believed to make up some 85% of the universe. The Belle II experiment, which operates at the SuperKEKB electron-positron collider in Tsukuba, Japan, searched for a hypothetical new particle called the Z’ that may …

  June 21, 2019, Prof. Tom Browder (University of Hawaii) turned over the role of the Belle II spokesperson to Prof. Toru Iijima (Nagoya University, KMI).  The Belle II Experiment is an international collaboration of about 1000 physicists and engineers from 26 countries. Together we explore the fundamental secrets of the Universe with the SuperKEKB cutting-edge electron-positron collider and the new Belle II particle detector. I am greatly honored to be elected Spokesperson of this wonderful international team. Our experiment …

  On March 11th, 2019, Phase 3 operation of the SuperKEKB/Belle II project began successfully, marking a major milestone in the development of Japan’s leading particle collider. This phase will be the physics run of the project, in which the Belle II experiment will start taking data with a fully instrumented detector. The KEKB accelerator, operated from 1999 to 2010, currently holds the world record luminosity for an electron-positron collider. SuperKEKB, its successor, plans to reach a luminosity 40 times …

Particle physicists at Nagoya University were very excited watching the memorial event of the new international experimental project, the Belle II experiment using the SuperKEKB electron-positron collider at the KEK laboratory in Japan. On April 26 at 0:38 JST, 2018, the electron and position beams collided each other for the first time, and the particle reaction made by the collision was recorded by the Belle II particle detector. This is one of the greatest milestones of the project. The excitement …