The two ratios match with a precision of 1.6 billionths of a percent.
It’s confirmed: Protons and antiprotons are well-matched. The two types of subatomic particles mirror each other in the ratios of their electric charge to mass, a new extremely precise experiment verifies.
Antiprotons are the antimatter counterpart of protons. Every type of matter particle has such an alter ego, with similar properties but opposite electric charge. But antimatter is an enigma: Scientists still don’t understand why matter is common in the universe while . To investigate the origins of this asymmetry, scientists keep checking, to ever greater precision, for differences between matter and antimatter particles, which could hint at how matter came to dominate the cosmos.
The Baryon Antibaryon Symmetry Experiment, or BASE, at the European particle physics laboratory CERN, near Geneva, measures the oscillations of a single antiproton confined within an electromagnetic trap. These oscillations, which reveal the charge-to-mass ratio of the antiproton, are compared with those of a trapped hydrogen ion, comprising a proton and two electrons, which give the proton charge-to-mass ratio.with a precision of 1.
France Dernières Nouvelles, France Actualités
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