antimatter

From CNN, July 22, 2017: Fermilab scientist Don Lincoln explains how the Deep Underground Neutrino Experiment, which had its groundbreaking ceremony on July 21, could answer important questions of the universe, including, “Where did the antimatter go?”.

From Science, March 6, 2017: For more than a decade, multiple experiments have found an unexpected excess in the number of high-energy antielectrons, or positrons, in space. A team led by Fermilab’s Dan Hooper has shown that pulsars, not dark matter annihilation, can indeed produce most or all of the excess.

Antimatter in the universe is extremely rare; the universe is made pretty much entirely out of matter. DZero digs deeper into a previous, unusual result measuring the difference between matter and antimatter.