An Asymmetric Electron-Positron Collider for B Physics

Operation of KEKB was started at Dec., 1998 and turned off at Jun.30, 2010.
Many challenges and efforts were performed in order to increase luminosity.
Total integrated luminosity of 1052 /fb. was accumulated by Belle detector.
KEKB will be upgrade to SuperKEKB which have 40 times higher performace.
The construction is now on-working.

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Last Update: 2011.10.19