The SeaQuest experiment finds that down antiquarks within the proton are more prevalent than up antiquarks.
The proton’s antimatter is out of whack. An imbalance between two types of antiparticles that seethe within the proton is even wonkier than previously thought, a new measurement indicates.
Protons are built from three quarks — two “up” quarks and one “down” quark. But they also contain a roiling sea of transient quarks and antiquarks that fluctuate into existence before swiftly annihilating one another. Within that sea, down antiquarks outnumber up antiquarks, measurements revealed in the 1990s. Andin a realm of quark momenta previously unexplored, researchers from the SeaQuest experiment at Fermilab in Batavia, Ill.
The measurements are important for studies at the Large Hadron Collider at CERN in Geneva, which slams protons together to look for new phenomena. To fully understand the collisions, physicists need a thorough accounting of the proton’s constituents. “They need to know what they’re colliding,” says study coauthor Paul Reimer of Argonne National Laboratory in Lemont, Ill.
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