For the First Time, Physicists Have Measured the "Strong Force" of Antimatter
The nuclear strong force binds the smallest bits of matter together to form atoms, thereby making our material world possible. Physicists at Brookhaven National Laboratory have made the first-ever measurement of a similar strong force for antimatter — the mirror image of regular matter that lies at the heart of one of our biggest cosmological mysteries.
The experiments were conducted by the STAR collaboration at Brookhaven’s Relativistic Heavy Ion Collider (RHIC); the results appeared last week in Nature. RHIC recreates conditions similar to those of the universe just after the Big Bang by accelerating heavy atoms (like gold) to speeds approaching the speed of light, then slamming them into each other. The resulting fireball creates a gooey plasma of quarks and gluons — the most fundamental building blocks — as well as tons of matter and antimatter particles.
These particles don’t hang around for very long because matter and antimatter are polar opposites: antimatter has a negative charge to counter matter’s positive charge, and they annihilate into energy when they collide. There should have been equal amounts of matter and antimatter at the birth of the universe, too, but for some reason, matter gained the tiniest bit of an edge. And good thing, too, otherwise our beautiful material world wouldn’t be here. Today, matter dominates our universe, while antimatter is extremely rare.
This is a small contribution to ongoing efforts to resolve the matter-antimatter mystery by conducting not only more precise tests, but also to approach the problem from a new angle. “We did not expect to solve the whole thing,” Tang told Gizmodo. But they did learn something valuable about the antimatter strong force. And one day, all that accumulated knowledge will crack the case.