Belle II Resumes Operations – CERN Courier

Belle II Marks Major Milestone with First E+e– Collisions since Shutdown, Promising Further Discoveries in Particle Physics Research

Belle II, the fully instrumented detector at SuperKEKB in Japan, recorded its first e+e– collisions since summer 2022 on 20 February. This marked a major milestone for the experiment and the accelerator, as researchers eagerly awaited the results of the first collisions since the facility underwent a scheduled long shutdown.

During this time, several enhancements were made to the facility to handle expected increases in luminosity and backgrounds from the beams. A new vertex detector and an improved beam pipe at the collision point were installed, along with additional measures to improve radiation shielding and data collection performance.

The primary goal of Belle II is to uncover new phenomena through precise analysis of B mesons and other particles produced by the SuperKEKB accelerator. With a long-term objective of accumulating a dataset 50 times larger than that of the former Belle experiment, Belle II is set to push the boundaries of particle physics research.

The start of Run 2 in the Belle II control room on 20 February was marked by excitement and anticipation as scientists eagerly awaited the first e+e– collisions since the facility’s shutdown. The dedication and hard work of the teams involved in the upgrades and preparations for Run 2 have paid off, and the scientific community looks forward to

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