Belle experiment

The Belle experiment was a particle physics experiment conducted by the Belle Collaboration, an international collaboration of more than 400 physicists and engineers, at the High Energy Accelerator Research Organisation (KEK) in Tsukuba, Ibaraki Prefecture, Japan.

Belle at KEKB together with the BaBar experiment at the PEP-II accelerator at SLAC were known as the B-factories as they collided electrons with positrons at the center-of-momentum energy equal to the mass of the ϒ(4S) resonance which decays to pairs of B mesons.

[4] Belle II is located at SuperKEKB (an upgraded KEKB accelerator) which is intended to provide a factor 40 larger integrated luminosity.

Highlights of the Belle experiment include The KEKB accelerator was the world's highest luminosity machine at the time.

The integrated luminosity collected at the ϒ(4S) mass was about 710 fb−1 (corresponding to 771 million BB meson pairs).

The Belle detector in Tsukuba Hall, KEK
The retired central drift tracking chamber from Belle, now exhibited at the National Museum of Nature and Science .