Evidence of CP violation in B meson decays at the BaBar detector at SLAC,the Stanford Linear Accelerator Center,California. The computer display shows BaBar in cross-section. An electron & positron,accelerated in SLAC's PEP-II collider,annihilate at centre to produce a B meson and an anti-B meson. They live too briefly to be seen but are revealed by their decays. One decays to a kaon & three pions (red tracks),the other to a J-psi & a neutral kaon. These are also unseen,but the J/psi decays to two muons (orange tracks,right),the kaon to two pions (orange tracks,left). CP violation is the breakdown of charge & parity symmetries in certain particle interactions |