Belle II Detects First e+e- Collisions, Marking Start of Run 2 and Unveiling New Discoveries in Particle Physics

Belle II resumes operations at CERN

The Belle II detector at SuperKEKB in Japan recorded its first e+e- collisions on 20 February, marking the start of Run 2 after a scheduled long shutdown that began in summer 2022. During this time, several upgrades were made to the facility to handle the expected increases in luminosity and backgrounds originating from the beams.

One of the key upgrades was installing a new vertex detector with a fully implemented pixel detector at the collision point. This will allow researchers to collect more precise data and gain deeper insights into particle physics. 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 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 is to accumulate a dataset that is 50 times larger than that of the former Belle experiment, which will enable 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.

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