Belle II’s Rebirth: First Successful Collisions in February 2023 Mark New Chapter in Particle Physics Discoveries

Belle II resumes operations at CERN

In 20 February, the Belle II detector at SuperKEKB in Japan recorded its first e+e- collisions after a scheduled long shutdown that began in summer 2022. The facility underwent several upgrades during this shutdown to better handle the expected increases in luminosity and backgrounds originating from the beams. These upgrades included installing a new vertex detector with a fully implemented pixel detector and an improved beam pipe at the collision point. Additionally, enhancements were made to the radiation shielding around the detector and other measures were implemented to improve data-collection performance.

The Belle II experiment, which first recorded collisions in the fully instrumented detector in March 2019, aims to uncover new phenomena through precise analysis of the properties of B mesons and other particles produced by the SuperKEKB accelerator. The long-term goal of Belle II is to accumulate a dataset that is 50 times larger than that of the former Belle experiment. This ambitious goal will allow researchers to delve deeper into the mysteries of particle physics and potentially discover new physics beyond the Standard Model.

Overall, this successful start of Run 2 at Belle II marks an important milestone in ongoing research efforts at the facility. With an upgraded detector and improved performance measures in place, researchers are now poised to collect high-quality data that could lead to exciting discoveries in particle physics research.

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