STANFORD LINEAR ACCELERATOR CENTER / SCIENCE PHOTO LIBRARY STANFORD LINEAR ACCELERATOR CENTER / SCIENCE PHOTO LIBRARY
SLAC accelerator. Aerial view of the Stanford Linear Accelerator Center (SLAC) with the linear accelerator (upper right) and PEP-II collider highlighted. Electrons from the electron gun (orange) and positrons from the positron source (green) are accelerated in the linear accelerator. In the PEP-II (large ring) the electrons (red ring) and positrons (yellow ring) are circulated in opposite directions. They collide in the BaBar detector (blue), creating B mesons and anti-B mesons. Differences in these particles' rates of decay may explain why there is more matter than antimatter. SLAC is in California, USA.
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