DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
BaBar particle detector. Engineers working on the BaBar particle detector at the Stanford Linear Accelerator Center (SLAC) in California, USA. It is hoped that BaBar will help to explain why there is more matter than antimatter in the universe. The twelve panels contain thousands of photocells viewing a large tank of ultrapure water in which subatomic particles form characteristic rings of blue light. BaBar will detect the B mesons and their antimatter equivalents, anti-B mesons, that result from the collisions of electrons and posit- rons circulated around the PEP-II collider. To explain the greater amount of matter, B mesons and anti-B mesons should decay at different rates.
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