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In 1976, a particle called the B0 meson and its antiparticle,
the B0bar, were discovered. Similar to the K0 and K0bar
mesons, but about 10 times heavier, physicists soon
realised that these should also show similar CPviolation
effects. B0 mesons have a very short lifetime and decay in
about one thousand-billionth of a second. Until recently it
was not possible to produce enough of them to observe CPviolation. Now a new particle accelerator, called PEP-II, is
about to operate in Stanford, California and will achieve
the necessary conditions.
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