4f. CP violation in
B decays: where is it being studied?

guided tour

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Two experiments in the world are currently able to measure CP violation in B decay. They are listed in the table below, with locations.

Experiment	Accelerator	Laboratory	Location
BaBar	PEP-II (electron-positron)	Stanford Linear Accelerator Center (SLAC)	Stanford, California, USA
BELLE	KEKB (electron-positron)	High Energy Accelerator Research Organization (KEK)	Tsukuba, Japan

Some experiments that have paved the way for these new experiments by detecting and making measurements on B decays are listed below.

Experiment Accelerator Laboratory Location

CDF Tevatron Fermilab Batavia, Illinois, USA

CLEO II Cornell Electron
Storage Ring (CESR) Laboratory of Nuclear
Studies, Cornell Ithaca, NY, USA

In 1998, the CDF experiment was the first to report an attempt to measure CP violation in B decay. An updated result that included more data was reported in 1999. Even with the update, the result was inconclusive because of insufficient data. In 2000, both the Belle and Babar experiments reported on their first measurements, which were not conclusive. By February 2001 both experiments had collected far more data. In combination, the two results indicated significant evidence for CP violation in B decay. Results presented by both experiments in July 2001 only strengthened this conclusion.

Each facility discussed on this page has web pages, which can be found from our links page.