The measurements show no difference between matter and antimatter, within the accuracy the scientists could achieve. That leaves another puzzle, as it rules out an asymmetric quirk of the strong force that could account for the abundance of matter and the scarcity of antimatter in the Universe today.
“The Big Bang at the beginning of the Universe produced matter and antimatter in equal amounts. But that’s not the world we see today. Antimatter is extremely rare. It’s a huge mystery,” says Aihong Tang, a Brookhaven physicist involved in the analysis, which used data collected by RHIC’s STAR detector.
“Although this puzzle has been known for decades and little clues have emerged, it remains one of the big challenges of science. Anything we learn about the nature of antimatter can potentially contribute to solving this puzzle.”