STANFORD LINEAR ACCELERATOR CENTER / SCIENCE PHOTO LIBRARY STANFORD LINEAR ACCELERATOR CENTER / SCIENCE PHOTO LIBRARY
BaBar particle detector. Engineers working on the BaBar particle detector at the Stanford Linear Accelerator Center (SLAC), California, USA. It is hoped that BaBar will help to explain why there is more matter than antimatter in the universe. BaBar will detect the B mesons and anti-B mesons that result from the collisions of electrons and positrons circulated around the rings of the PEP- II collider. The collisions will occur at the centre of this cylindrical device. To explain the greater amount of matter in the universe, B mesons should decay at a different rate from their antimatter counterparts.
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