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Belle II Collaboration

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Tsukuba-shi, Ibaraki
Belle II Collaboration

Belle II is an international experimental particle physics collaboration

Belle Ⅱ is an international joint experiment studying heavy quark physics using the Belle II Detector at the SuperKEKB accelerator at KEK in Tsukuba, Japan.

17/03/2026

On the 13th of March, the experiment at KEK’s accelerator reached an important milestone for this Run: an integrated luminosity of 3 fb⁻¹ in a single day. This means that roughly three million B mesons pairs were produced in one day.

26/01/2026

Thanks to the hard work of the and teams, we are ready to start 2026 operations! The Belle II Solenoid has been turned on and we’ll begin Main Ring operation today after the 2025-26 winter shutdown. Here’s to a 2026 with stable operation and bountiful data!

Belle IIとSuperKEKBチームのお陰で我々が２０２６年度ランを始まる！Belle IIのソレノイドはONになり、メインリングオペレーションは今日から開始する。２０２５−６年の冬シャットダウンの後、データ豊かかつ安定なランニングの２０２６年へ！

22/12/2025

As we move towards the end of the year, Belle II and SuperKEKB have just finished the 2025 run schedule. The coming weeks will see inspections and possible tweaks to improve performance in 2026 and a well-deserved rest for the New Year's holiday. Thank you to the operations team and all shifters who made it possible to have a great run, and we'll be looking forward to doing even better in 2026!

住所

Tsukuba-shi, Ibaraki
3050801