ABSTRACT
Two experiments, BABAR at SLAC and Belle at KEK, were succeeded in presenting new evidence for CP violation, so that 37 years after its discovery in decays of neutral K mesons, the effect is now established for the first time in a second system, the decays of neutral B mesons. This chapter discusses two proposals for B-meson factories. The first proposal was worked out at the Swiss National Laboratory PSI, but was not funded. The subsequent proposals at SLAC and KEK were approved in 1993, and construction of the two machines PEP-II and KEK-B started more or less immediately. In July 2000, the first BABAR and Belle results were reported at the International Conference for High Energy Physics. The Belle detector consists of a silicon vertex detector, a drift chamber, a particle identification system, an electromagnetic calorimeter, and an instrumented flux return for KL identification. It is quite similar to BABAR, with the main difference being in the particle identification.
