B-Production Facilities

Because of the small visible branching ratios of decays to CP eigenstates, ${\cal O}(10^{-5}),$ a large number of B meson must be produced in order to study CP violation in the B system. There are two complimentary ways to achieve the necessary large number of B mesons. The first is at e⁺e^- colliders at centre of mass energy of 10 GeV to produce the $\Upsilon(4S)$ which then decays to two B mesons. Alternatively high energy hadron machines, where there is a large cross section for $b\bar b$ production, can be used to produce the B mesons. The pros and cons of the various approaches are discussed in this sections.