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Belle II Resumes Operations – CERN Courier

The Belle II detector at SuperKEKB in Japan has recorded its first e+e– collisions since summer 2022 on 20 February. This was a major milestone for the experiment and the accelerator, as it marked the start of Run 2.

The facility underwent a scheduled long shutdown during which several enhancements were made to handle expected increases in luminosity and backgrounds from the beams. These included the installation of a new vertex detector and an improved beam pipe at the collision point, as well as improvements to radiation shielding and data collection performance.

The fully instrumented Belle II detector had its first collisions recorded in March 2019, with the primary goal of uncovering 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 researchers and scientists eagerly awaited the results of the first e+e– collisions since the facility’s shutdown. This milestone represents a major step forward for the Belle II experiment and the SuperKEKB accelerator, setting the stage for groundbreaking discoveries and advancements in the field of particle physics. 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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