Words nearby antiquark
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Models made different predictions for how the ratio of down and up antiquarks should change as you count antiquarks that carry more energy.
Then, a decade later, another group saw hints of puzzling variations in the down-to-up antiquark ratio.
Yet Miller calls this rival model “descriptive, rather than predictive,” since it’s tuned to fit data rather than to identify a physical mechanism behind the down antiquark excess.
When the “NuSea” experiment at Fermilab measured the down-to-up ratio as a function of antiquark momentum in 1999, their answer “just lit everybody up,” Alberg recalled.
Within that sea, down antiquarks outnumber up antiquarks, measurements revealed in the 1990s.Protons’ antimatter is even more lopsided than we thought|Emily Conover|February 24, 2021|Science News