B-Factory commissioning and first result

Performances of two B-Factories, PEP-II at SLAC and KEKB at KEK, have been steadily improved during these two years from the start of physics experiments in mid 1999. PEP-II peak and integrated delivered luminosities per day, per week, and per month (3.30 × 10³³ cm^-2s^-1 184/pb, 1036/pb, 3.8/fb) had surpassed its design goals in October 2000. The performance of KEKB has been improved rapidly in 2001 and it recorded the peak luminosity of 4.04 × 10³³cm^-2s^-1 in June 2001. The maximum integrated logged luminosity per day and per month by BELLE amounted to 224/pb and 4.7/fb. These high performance of the B-Factories are attributed to successful fine tuning of the machines and also to the suppression of beam blow-up due to electron cloud instabilities by a solenoid field imposed on the positron ring vacuum chambers. We reasonably expect that by the end of 2002 BaBar at PEP-II and BELLE at KEKB will have logged 100/fb. A path to a luminosity of 2 × 10³⁴cm^-1 at PEP-II has been proposed and a study of super KEKB with a luminosity of 10³⁵cm^-2s^-1 has started. In February 2001, BaBar and Belle have published their first results on CP violation